<!-- 
DTD for Nature US, Copyright 2009 Modified by Paul Donohoe, Nature Publishing Group.)
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<!--
For use with XMetaL 2.0:
(a) Initial doctype declaration has been removed;
(b) Relative paths to ISO entity files have been added to entity declarations; and
(c) ArborText's SGML declaration ati-dftl.dcl has been added to the Rules directory
as article.dec.
-WB, 10/19/00
-->
<!--
Version 2.7.9, 26/01/11
Please refer to DTD Change History for list of changes and dates.
-->
<!--
DTD Change History (yyyy/mm/dd format)

2013/08/14 - HUBXML-18 - Added 'url' attribute to "datafile" element to support Tableau interactive figures

2013/07/22 - HUBXML-16 - Added "secr" element with required 'rid' attribute; Added optional @id attribute to "sec" of type ID; Added optional @type attribute to "sec" with allowed value 'excerpt'

2013/04/02 - SCHEMA-92 - Added "geneseq" and "proteinseq" as possible elements within entity %data;

           - SCHEMA-91 - Added "tiff" to values for entity %figure-data;

2013/02/01 - SCHEMA-90 - Added new optional element "data-citations" as a child of "bm"
                         Multiple "data-citation" children, which have multiple optional "refau" children 
                         "data-citation" has required attributes: 'db-name', 'id', 'url', and 'year'; optional attribute 'source' which can take values "existing" or "new"

           - SCHEMA-89 - Added new optional element "auid" as a child of "au", "cau" and %author entity, to allow inclusion of ORCIDs for authors

2013/01/16 - SCHEMA-88 - Add "fav" to allowed values of article 'publish' attribute and pubdate 'type' attribute.

2012/11/15 - SCHEMA-81 - Added new values ("docx", "png" and "xlsx") to %figure-data (used for datafile "type" attribute).

2012/09/26 - SCHEMA-79 - Add new values ("is-protocol-update-to" and "has-protocol-update") to "related-article-type" attribute of "related-article"

2012/08/30 - SCHEMA-78 - Added a "datafile-type" attribute to the "datafile" element with values 'figure-data' (default) and 'interactive'.
                         Removed 'interactive' as possible value of "fig-type" on the element "fig".

2012/08/23 - SCHEMA-77 - Added 'interactive' as possible value of "fig-type" on the element "fig".

2012/08/23 - SCHEMA-76 - Added "accession" as a possible element in %data; Removed "accession" from %entry; "aff" "caff" and "p" in NPG_XML_Article.dtd and from "title" in Calstbl.dtd 

2012/08/23 - SCHEMA-75 - Added 'box-figure' as possible value of "fig-type" on the element "fig".

2012/07/03 - SCHEMA-71 - Created new optional element "article-link" within "pubfm", with required attributes 'link-type' and 'extrefid'.

2012/06/28 - SCHEMA-68 - Added 'est' (Expressed Sequence Tag Database), 'gss' (Genome Survey Sequence Database), 'pccid' (PubChem Compound), 'pcsid' (PubChem Substance), and 'emdb' (Electron Microscopy Data Bank) values to the "type" attribute on the "accession" element. 

2012/05/23 - SCHEMA-66 - Made "url" attribute on "ext-media" element optional.

2012/05/18 - SCHEMA-65 - Created new optional element "cps" as child of "cpg" to contain copyright statement.

2012/05/18 - SCHEMA-63 - Made "tgroup" optional within "table" and additional changes made to attributes of "table" in XML_Calstbl.dtd.

2012/03/29 - SCHEMA-57 - Added new optional attribute "fig-type" to the element "fig", with allowed value "suppinfo".

2012/03/13 - SCHEMA-56 - Added new element "infographic", optional and repeatable within element "objects" (and also "slideshow").
                         Allowed optional child elements "title", "caption" and "credit" within "infographic" element.
                         Allowed attributes of "infographic" are the same as for "fig" ('id', 'type', 'entname', 'entref', 'file').
                         Added new element "infographicr" to %textref; entity set, with "align" attribute (as found in "illusr").

2012/03/05 - SCHEMA-55 - Added new optional attribute "type" to the element "suppobj", with allowed values "audio" and "video".

2012/02/29 - SCHEMA-54 - Added new allowed value of "has-protocol" to the "related-article-type" attribute of element "related-article".

2012/01/16 - SCHEMA-52 - Changed default value for "style" attribute of "bibl" element to "alpha".

2012/01/13 - SCHEMA-44 - Made "meta" element recursive by adding "meta" to it's definition.  Added parent "ext-media" element to the supplementary info object element "suppobj".

             SCHEMA-50 - Added "doc" to list of values in %figure-data; entity set.

2011/12/19 - SCHEMA-45 - Added new attribute "style" to "bibl" element, with allowed values "numero" (default) and "alpha".

             SCHEMA-47 - Added new allowed value of "is-protocol-to" to the "related-article-type" attribute of element "related-article".

2011/11/23 - SCHEMA-42 - Added "ena" value to the "type" attribute on the "accession" element for European Nucleotide Archive database accession links. 

2011/11/07 - SCHEMA-40 - Added new attribute "illus-type" to "illus" element, with allowed values "illustration" (default) and "infographic"

2011/10/28 - SCHEMA-39 - Added "code" element to %data; entity set; removed duplicate entry for element "p".

2011/09/23 - Ontologies - Made "code" attribute of "technique" element optional.

2011/09/16 - SCHEMA-38 - Added 'bioproject' value to the "type" attribute on the "accession" element for BioProject database accession links. 

2011/09/15 - Ontologies - Added "id", "type", "version" and "path" attributes to "technique" element.

2011/09/06 - SCHEMA-32 - Added "pdf" to allowable values of %figure-data; entity set.

2011/09/05 - SCHEMA-34 - Added "licence" as allowable value of "chgtype" attribute of "chg" element.

2011/08/25 - SCHEMA-31 - Added "display" attribute to "topic" element with allowed values "hide" and "show" (default)

2011/08/19 - SCHEMA-25 - Added element "stndfrst" optional within element "bx".

           - SCHEMA-30 - Created new element "uc" for uppercase text content and added to "%fontchng;" entity set

2011/08/18 - SCHEMA-29 - Created new element "role" and allowed optional within elements "au", "cau" and "auname"

           - SCHEMA-28 - Create new entity set "%entityref" to include elements "annotation-ref and "named-entity";
                         Replaced elements "annotation-ref and "named-entity" with entity set "%entityref;" in definition for entity set "%textref;";
                         Added "%entityref;" entity set to definition for entity set "%plain-text;";
                         Removed subsequent duplicate element inclusion of "annotation-ref" and "named-entity" within definitions for elements "company", "prod" and "scientific".

           - tighten   - Restricted elements "subject" and "technique" to contain only #PCDATA.

2011/07/27 - SCHEMA-26 - Copied table model entity %tabl; from XML_Calstbl.dtd and allowed elements "caption" and "credit".

             SCHEMA-25 - Allowed element "ext-media" optional and repeatable within element "objects".
                         Added new element "slideshow" optional and repeatable within element "objects".
                         Allowed elements "fig" and "illus" within "slideshow" element and added new reference element "slideshowr" to "%textref;" entity set.
                         Made elements "chgperson" and "chgreason" optional within "chg" element.
                         Added "clarification" to list of allowed values of "chgtype" attribute of "chg" element.

           - SCHEMA-24 - Added new "type" attribute to "websumm" element, with allowed values of "toc" and "regular" (default).

2011/07/14 - SCHEMA-17 - Added the following values for "related-article-type" attribute of "related-article" element:
                         'is-correction-to', 'is-corrigendum-to', 'is-erratum-to', 'is-retraction-to', 'is-addendum-to', 'is-response-to', 'is-comment-to', 'is-news-and-views-to', 'is-research-highlight-to', 'is-related-to'

             SCHEMA-20 - Allowed element 'aufnr' optional and repeatable within 'group' element.

2011/06/28 - SCHEMA-15 - Added 'biomodels' value to the "type" attribute on the "accession" element for BioModels database accession links. 

2011/06/28 - SCHEMA-14 - Added new optional element "start-date" to "licence" element, to allow delayed start of licence conditions; allowed multiple "licence" elements within "pubfm" and "suppfm" elements.

2011/06/14 - SCHEMA-12 - Added "jpg", "jpeg" and "gif" to allowable values of %figure-data; entity set.

2011/06/02 - SCHEMA-11 - Added new element "ext-media" optional and repeatable within "bdy" and "sec" elements; added new element "ext-mediar" element to "%textref;" entity set.

2011/04/15 - SCHEMA-10 - Added attribute "paid" optional within "author-paid" element

2011/04/05 - Ontologies - added "npg.subject" and "npg.technique" as allowable values of "subject" element "type" attribute, and set "npg.subject" as default.

2011/02/28 - SciRep - added element "elocation" optional to "pubfm" element, to hold identifier for citations of online-only content.

2011/02/28 - SCHEMA-8 - Added 'bmrb' to list of allowable values of the "type" attribute of the "accession" element for Biological Magnetic Resonance Data Bank database accession links.

2011/01/26 - SCHEMA-6 - added optional "type" attribute to "named-entity" element, with allowed values "compound" and "geneprot", and optional "entity" attribute with CDATA content.

2011/01/26 - SCHEMA-7 - added "docm", "xlsm", "pptm", "pptx" and "tgz" to %notation; entity set.

2010/12/15 - SCHEMA-5 - added "embargo" value to "type" attribute of "pubdate" element

2010/12/08 - Ontologies - added optional attributes "id", "path", "type" and "version" to the "subject" element; made "code" attribute optional.

2010/12/02 - ICB - added "icb" value to %notation;, added optional "id" and "type" attributes to "code" element; added "code" element optional and repeatable to "media" element; created new element "coder" to link text to "code" element, and added to %textref;.

2010/11/05 - SciAm - made "role" attribute of "image" element optional; added "imager" element optional within elements "au" and "cau".

2010/09/20 - tighten - Removed element "p" from allowable child elements of element "crosshd".

2010/09/15 - SCHEMA-1 - Created new element "named-entity" and added to %textref; and allowed within "prod", "company" and "scientific" elements.

2010/09/02 - sync - Added 'ensembl' value to TYPE attribute on ACCESSION element for Ensembl database accession links.

2010/08/02 - XBC-833 - Added 'pcaid', 'pride' and 'sra' values to TYPE attribute on ACCESSION element for PubChem AID, Proteomics Identification Database and Sequence Read Archive database accession links.

2010/08/18 - XBC-808 - Added "docx" and "xlsx" to %notation; entity set.

2010/07/26 - loosen - Changed "id" attributes of "categ", "subcateg" and "subsubcateg" elements from %categ; %subcateg; and %subsubcateg; parameter entities to CDATA.  
                      Removed associated file npgcateg.mod and associated parameter entity %npgcateg; from DTD.
                      As part of this change, the elements "categtxt", "subcatxt" and "subsubcatxt" are now deprecated.

2010/07/23 - SciAm - Made element "title" optional within element "article-grouping".

2010/07/21 - XBC-725 - Added elements "critical", "trouble", "caution", "pause" and "timing" optional and repeatable within element "li".

2010/07/12 - XBC-655 - Added elements "critical", "trouble", "caution", "pause" and "timing" optional and repeatable within element "bx" for boxes.

2010/07/12 - XBC-677 - Removed element "accession" from elements "aff" and "caff"; added element "accession" to parameter entity "entry" for tables.

2010/06/28 - XBC-263 - Added new allowable value "mgi" for "type" attribute of "accession" element for Mouse Genome Informatics.

             XBC-15 - Added "csv" to %notation; entity set.

2010/06/15 - XBC-625 - Added new allowable values for "id" attribute of "section" element - "this-week", "news-in-focus", "comment", "careers", "research"

2010/06/09 - Ontologies - Added new element "technique" optional and repeatable within pubfm and suppfm

2010/05/12 - Extension - replaced "#PCDATA | %fontchng;" with "%plain-text;" in many elements to allow <character> content: "code", "chemical-formula", "ancref", "bibrinl", "bxr", "deflistr", "fdr", "figr", "fnr", "fr", "annotation-ref", "illorinl", "mediar", "tablr", "compoundr", "schemer", "sir", "cir", "weblink", "xnav", "xref", "company", "prod", "brandname", "scientific", "indications"

2010/05/07 -         - Changed allowable values for "related-article-type" attribute of "related-article" element to only "protocol".

2010/04/26 - Pubmed - Allowed element "aff" as optional within element "contributor".

           -         - Added new element "related-article" optional and repeatable within pubfm

2010/04/15 - XBC-388 - Added optional "code" attribute to "arthead" element.

             XBC-386 - Added optional "guid" attribute to "article" element.
             
             Extension - Created new entity %plain-text; composed of %straight-text; and %fontchng;
             
             SciAm - Allowed %plain-text; within elements "subject" and "subclass" 

2010/03/24 - XBC-293 - Allowed element "annotation-ref" within "prod", "company" and "scientific" elements.

2010/03/23 - Annotations - Created new element "meta" within "compound" to hold (initially) chemical probe information.

2010/03/15 - SciAm - Created new element "section" within "pubfm" to hold magazine section  Required attribute "id" can have values "departments", "features" or "online".

2010/03/08 - SciAm - Allowed element illus as optional within media

2010/02/15 - SciAm - Changes to accommodate Scientific American data:
							Added new date element 'created', optional within 'hst'
							Added new values 'prototype', 'offline' and 'retired' to @publish attribute of element 'article'
							Allowed elements 'title' and 'image-alt' optional within element 'illus'
							Added new values 'overview', 'sidebar', 'infographic', 'audio', 'video', 'pdf' and 'photo-album' to 'type' attribute of element 'weblink'
							Added 'role' attribute to 'subclass' element
							Added optional 'hour' and 'minute' attributes to 'created' and 'pubdate' elements.
							

2009/12/14 - CSTORE-36 - Added new element "character" to %straight-text; to hold non-Unicode characters in place of named entities.

           - Added "ar" (Arabic) to allowed values of entity %language for Nature Middle East

2009/10/07 - SciBX   - Added new element alt-title to hold an alternate HTML title

2009/09/25 - XB-2887 - Added display attribute to cite element

			   - Cloned element cvd from AJ DTD for Scientific American

2009/08/20 -         - Allowed multiple kwdg within fm

           - XB-2826 - Allowed multiple audecl within bm; added optional id attribute to audecl; created new element audeclr, optional within au, group and cau


2009/07/24 -         - Changed all entname attributes to CDATA and added new entref attributes of type IDREF.
                     - Added new elements entity-declarations and entity
                     - To allow deprecation of <!ENTITY> declarations for external objects.

           - MSB     - Allowed multiple datafile elements within suppobj
           
           - EMBOR   - Relaxed content of cite type attribute to CDATA.

2009/06/17 - XB-2510 - Extended element assoc-file to contain optional weblink element; made entname attribute optional.
             EMBOR   - Relaxed content of contributor role attribute to CDATA

2009/05/29 - XB-2608 - New elements arthead and artsubhead within pubfm for Scientific American, and entity tocshow for display options.

           - XB-2661 - New element article-grouping within pubfm for EMBO Reports.  Allowed element aufnr within cau.
           
           - XB-2540 - Allowed both pp and seq instead of either.

2009/04/27 - XB-2566 - Allowed element p within element endnote.

2009/04/20 - XB-2541 - New element "quote" to contain external quotes, allowed within "bdy" before first "p".

2009/03/16 - XB-2434 - Compound highlighting changes: removed child element order restriction from "annotations"; added "id" attribute to "annotation-item"; changed "date" attribute of "annotation-item" to "created" (required) and "updated" (optional) attributes; added "title" (required), "inchikey", "stdinchi" and "stdinchikey" attributes to "annotation-compound"; added "title" attribute to "annotation-ref"; changed "pubchem" and "chemspider" attributes of "annotation-compound" to CDATA.

2009/02/27 - XB-2434 - Added new elements "annotation-ref", "annotations", "annotation", "annotation-item" and "annotation-compound" for compound highlighting.

2009/02/16 - XB-2355 - Added attribute "type" to "inchi" and "inchikey" elements, and made both elements repeatable.

2009/02/16 - XB-2214 - Added "language" and "display" attributes to "code" element.

2009/02/16 - XB-2405 - Added element "label" to "datafile" element.  Added "datafile" element to "suppobj" element.

2009/02/16 - XB-2388 - Added "sdf" and "png" to %notation.

2008/12/15 - XB-2207 - Added new "code" element to "p" to represent computer code.

2008/12/15 - XB-2209 - changed "indications" element to allow it to contain text and font-changing elements.

2008/12/12 - added new attribute "role" to "group" element to replace "contrib-level" attribute, which is now deprecated.

2008/12/12 - XB-2254 - added %fontchng elements to "compoundr" element.

2008/11/18 - XB-2201. Created new element "assoc-file" and added to element "pubfm" for 3D-PDFs for Nature.

2008/11/03 - XB-2185. Created new element "compound-obj" and added to element "compound" for Chemistry journals.  Added "CDX", "CIF", "JDX", "MOL" and "PDB" to %notation.

2008/11/03 - XB-2184. Created new elements: "synonym", "chemical-formula", "mol-weight", "elemental-analysis", "inchi", "inchikey", "smiles" and added to element "compound" for Chemistry journals.

2008/11/03 - XB-2168. Created new element "chemimg" within "objects" and "chemimgr" within %emptyref for Chemistry journals.

2008/10/21 - XB-1974. Added "zip" to values for entity "figure-data"; allowed multiple "datafile" within "fig" for journal MSB.

2008/09/24 - XB-2106. Added new element "indications" to "pubfm" to allow new classification of articles in SciBx.

2008/08/11 - XB-1974. Added "CSV" to %notation; new entity "figure-data" for data types (file extensions); new element "datafile" to "fig" - to allow association and display of original data files for figures for journal MSB.

2008/08/11 - XB-1953. Added "nuccore" to type attribute of accession

2008/08/11 - XB-1985. Added "hans" to %language for Han-Simplified text

2008/08/11 - XB-1906. Added new elements: "image" to "objects", "imager" to %emptyref, "image-alt" to "image".

2008/08/11 - Changed element "group" to remove ambiguity, and added new attribute "contrib-level" to allow markup of different levels of group/consortia contribution.

2008/07/22 - XB-1897. Added element "sector" to pubfm for naturejobs.

2008/06/30 - XB-1816. Allowed multiple orf within group.
								Changed <!ELEMENT group (groupttl, grouptxt?, orf?,((group)* | (au | cau)*)*)> to <!ELEMENT group (groupttl, grouptxt?, orf*,((group)* | (au | cau)*)*)>

2008/05/19 - XB-1654. Created new element slide and added optional within fig and table (in external XML_Calstbl.dtd)
	     - XB-1303. Created new element autxt and added optional within au, cau, and replyau.

2008/03/10 - XB-1223. Added (critical | caution)* to element "matsgrp" to allow Critical and Caution notes at the start of the sections.

           - XB-1233. Added (critical | caution)* to element "proc" and element "procgrp" to allow Critical and Caution notes at the start of Procedure sections.

           - XB-1232. Added "timing" and "trouble" elements to element "mat" to allow these items within individual Material items.

           - XB-1231. Changed "#PCDATA" to "%data" within element "timing" to allow figure and table references.

           - XB-1234. Created new element "matsec" and added to content for "matsgrp" to allow subheadings within Reagents and Equipment - XB-1234

           - Added "nfv" to "issue" parameter values for element "article" - for "Near Final Version" articles.
           - Added "nfv" to "type" parameter values for element "pubdate" - for "Near Final Version" articles.
           - Changed "pubdate?" to "pubdate*" within element "hst" to allow multiple pubdates

2008/01/15 - Replaced "author-paid" element with new structure with parent element "licence", with attributes "model" and "version", and optional child elements "weblink", "licence-text" and "author-paid".

           - Added "pps" to %notation (format of Supplementary Info files) for XB-1273

2008/01/15 - Added new attribute "display" to element "atl"; values "show" (default) and "hide" for XB-1275.

2007/09/21 - Added new attribute "display-authors" to element "group"; values "yes" (default) and "no".

2007/09/18 - Added new 'ddbj' and 'swiss-prot' values to TYPE attribute on ACCESSION tag to handle new DNA Data Bank of Japan 
	and SWISS-PROT database links for Nature

2007/09/18 - Expanded EDSUMM attributes to allow for AOP-specific and issue-specific versions.  New attribute name 'publish' with allowed values 'issue' (default value) and 'aop'.

2007/09/12 - Expanded AUTHOR-PAID tagging to incorporate licence terms for Creative Commons, etc. Includes new elements URL and LICENCE-TEXT (XB-79)
	   - Expanded CONTRIBUTOR tagging to accomodate new requirements for NCP Medscape/CME articles (XB-1136)

2007/06/18 - Added new 'arrayexpress' and 'embl' values to TYPE attribute on ACCESSION tag to handle new European Molecular Biology Laboratory 
	and ArrayExpress database links for Nature Genetics
	   - Allowed more flexibility to GROUP model to allow a mixture of nested groups and/or authors within a group, rather than groups OR 
	 authors.

2007/05/14 - Added new CODE attribute to SUBCATEG to mimic CATEG tag. CODE allows generic alphanumeric code value that is defined in an
	   xbuilder configuration file as opposed to the DTD (e.g. <subcateg code="nrcc-sc1>"). Made SUBCATEG ID attribute optional as a result.
2007/04/23 - New CONTRIBUTOR role 'interviewer' added
2007/04/13 - New elements CONTRIBUTORS/CONTRIBUTOR created for holding any significant contributors to the content, secondary to the main 	
	   author/creator of the content. E.g. Interviewee, translator etc.) Optional ROLE attribute to declare specific role. Leave attribute off if role is generic/unspecific. New roles can be created on as-needed basis. (CON-672)
	   - Created new CONFIDENTIAL value for CONFLCT attribute on AUDECL element for authors bound by confidentiality agreements preventing them from disclosing their financial interests in their work.  (CON-525)
2007/01/30 - New alt-type attribute added to BIBL for scenarios when Reference section should be treated slightly differently than normal. 
	  Value of ALT-TYPE also becomes the replacement header for the Reference section. (e.g. Further Reading section in Nature articles, when Further Reading reference material is not cited in paper but reference links still need to 
	  be created for each item)
2006/12/12 - Added new type attribute to ARTSREVIEW for different types of Arts being reviewed (e.g. Play, Ballet, Opera). CON-398
	   - Added ORF element to GROUP to allow for Author group affiliations.
	   - Allowed SEC within ONLINE-METHODS. CON-292.
	   - Added new CONNOTEA attribute on KEYWORD to specify connotea link tag when keyword cannot be used as is. CON-437
2006/11/13 - Added new elements: artsreview, exhibitreview to BDY
           - Added TYPE attribute to BIB element. Allowable values are ORIG and REG (default). 'ORIG' used to identify a cited article as the 'original' article.
           - Added PRIORITY attribute to SUBJECT element. Allowable values are 1 and 0 (default). '1' used to identify a subject as the main/priority subject for that article.
           - Added new element AUTHOR-INFO to BM to support new structure in Nature Papers.
           - Added new element ONLINE-METHODS to SEC element to associate a Methods section with an 'Online' Methods equivalent.
2006/11/07 - Added new tar filetype to %notation
2006/11/06 - Added new article-number and doc-id elements to %reftxt;
2006/10/30 - Added new BACK value to attribute TYPE for RVWINFO element. Possible values are now NEW | OURS | BACK | REG (for nature physics book reviews).
2006/09/19 - Created new ALTDOI element for alternative DOIs. Requires unique LABEL attribute which establishes precedence. Zero or more 
	   allowed within PUBFM and SUPPFM.
	   - Made AFF/CAFF optional within AUG to allow for GROUPs with no associated affiliation.
2006/10/17 - Created new AUTHOR-PAID element within PUBFM to track author payment
	   - Allowed PUBDATE within %REFTXT so that publication dates can appear in references
	   - Created common keyword parameter entity to store common keyword content shared by KWD and KEYWORD elements
	   - Added DISPLAY attribute to REFDOI element to control display/suppression of doi in citations and references. Allowable values are 'show' and 'hide'. Occasionally REFDOIs are inserted to force resolution of a citation/reference and are not part of the 
	   original text. These cases should be explicitly suppressed/hidden in the XML via the atttribute. Otherwise, default rule is to 
	   Show.
	   - Created TYPE attribute on ISBN. Allowable values are 'print' or 'electronic' - 'print' default.
	   - Allowed ISBN within PUBFM. Choice is either ISSN or ISBN - not both.
2006/07/24 - Created new CIR element for compound information link which appears in print
2006/06/14 - Created new SEQ number for enforcing article ordering/sequence when there are no page numbers (online-only content)
	   - Made AU optional within GROUP for cases when only the author group/consortium name is provided, and no authors are supplied
2006/06/14 - Allowed CAUTION within STEP
2006/06/12 - Created new ENCODING element for content whose encoding does not match default encodings set for that language. TYPE attribute 
	     holds possible values of BASE64 and NONE for japanese and encoding-free content. 
	   - Allowed TIMING within TIMING for nested timing models in protocol procedures.
2006/05/22 - Created new parameter entity %straight-text containing PCDATA and LANG elements 
	   - Created new LANG element with type attribute allowing existing %language; values (eng | ger | kanji | spanish)
	   - Allowed CRITICAL within MAT for new protocols format
	   - Created new TIMING element within STEP for new protocols format
	   - Allowed P within TROUBLE for new protocols format
2006/04/25 - Created new COMPOUND element within OBJECTS to support nchembio compound structures.
	   - COMPOUND contains required NAME and LABEL elements and required ID, SID and ENTNAME attributes.
	   - Added RID attribute on COMPOUNDR element which targets the ID attribute on COMPOUND
	   - Added new element CONFSPONSOR to CONF element for sponsor supported conferences.
	   - Added new attribute 'code' to CATEG tag to reference generic configuration codes as opposed to hard coded DTD values (similar 
	   to SUBJECT tag). Made 'id' attribute optional as a result.
	   - Allowed optional BIO within AUNAME (in line with AU and CAU)
	   - Made IDT and PP optional within PUBFM (for online-only content)
2006/02/20 - Added optional MTSNO element to PUBFM and SUPPFM to capture manuscript tracking number (if available) for Protocols project
	   - Added TYPE attribute to EDSUMM to differentiate b/w standfirst-type editorial summaries and regular ones. Values are 
	     'standfirst' and 'regular' (default)
2006/02/01 - Added new %align-att; parameter entity to hold commonly referenced align attribute values (left, center, right etc.)
	   - Added %align-att to: 'horiz' attribute on ALIGN element, 'align' attribute on ILLORINL and ILLUSR
	   - Made 'external' default align value on ILLORINL (to facilitate placement of ILLORINL illustrtations on separate pages)
	   - Added 'spanish' to %language entity for upcoming NCP Spanish supplement
	   - Added new attribute 'status' to ACCESSION element to control primary or secondary (default) status. In the case of PDB codes, 
	   'primary' refers to newly submitted structures.	     
2005/12/14 - Added 'html' to %notation;
2005/11/22 - Changed IDTYPE to DBTYPE to better reflect purpose, and removed hard coded values (allowable values will be 
	     stored in external configuration files)
2005/11/09 - Added new IDTYPE to SCIENTIFIC tag to identify database. Current values are 'entrez' and 'uniprot'
	   - Allowed %fontchng; to SCIENTIFIC tag to allow emphasis tagging in genes/proteins
2005/10/21 - Allowed %emptyref; within WEBLINK to allow 'linked' illustrations for ISN.
2005/10/18 - Made CATEG optional within PUBFM and SUPPFM as we move away from hard coding category info into source XML.
2005/10/06 - Added new SCIENTIFIC tag to %data; to capture gene/protein markup for various publications on OMICS gateway. Optional ID 
	     attribute for potential internal/db ids.
	   - Created new %dateatt; parameter entity to hold common year, month, day attributes, all required. Referenced from applicable 
	     elements.
	   - Added new CONFENDDATE to CONF element for end date of conference. Needed for ISN conferences. Takes EMPTY tag format with 
	     required YEAR, MONTH, DAY attributes and optional TIME. (Differs from CONFDATE format, but did not change due to backward 
	     combatility issues in archive XML.)
	   - Allowed CONTACT within CONF for posssible conference contact. Needed for ISN conferences.
2005/09/28 - Added new element QUIZ to BDY. QUIZ made up of one or more QA-BLOCK. (For nature physics end game pieces)
	   - Allowed CROSSHD within ANSWER
	   - Added new attribute TYPE to RVWINFO. Possible values are NEW | OURS | REG (For nature physics book reviews - REG is default)
	   - Added new attribute ID to SUBCLASS for target CME linking (NCP)
	   - Allowed CONF within PUBFM.for ISN conferences
2005/08/10 - Added sif and noa to %notation; for new nature suppinfo types
2005/07/06 - Added %notation; to keyword
	   - Added 'wmv' to %format;
10/06/05   - Added new 'all' value to CODE attribute on CONT for region content that spans all continents
	   - Added new INTVW element within BDY for interview-style question and answer articles. Within INTVW allowed one or more QA-BLOCK 
	   elements which hold one set of QUESTION and ANSWER elements. QUESTION and ANSWER are permitted one or more P elements.
06/03/05   - Added new 'update' value to CHGTYPE attribute on CHG element
	   - Created new %glossid; parameter entity for reuseable GLOSSID attribute glossary database linking. Replaced GLOSSID 
	   attribute on TERM with %glossid; and added %glossid; to KWD.
	   - Made TIME attribute optional on BLOG ENTRYDATE.
	   - Changed CONT element from open PCDATA element to empty element with fixed continent values.
05/12/05   - Extracted %subsubcat; into external npgcateg.mod file and added new subsubcat ids: 'grad' 'mov' 'nuts' 'soc' 'sal'
	   - Added new element COMPOUNDR to %TEXTREF; for compound references in Nchembio papers. REF attribute is CDATA rather than IDREF 
	     because target ID is not inserted until build time.
	   - Added new element SCHEMER to %TEXTREF; for scheme references in Nchembio papers. RID attribute is of type IDREF and must 
	     resolve to ID on target SCHEME.
	   - Added new element SCHEME to OBJECTS. Carries required attributes ID and ENTNAME (for declaring scheme object file). Contains 
	     optional child elements SCHEMETL (scheme title) and CAPTION.
	   - Replaced type attribute value list on fig, subfig, scheme, illus with %notation;
05/09/05   - Added new empty element STATE to REGION tag. STATE holds standarad US state and Canadian province codes.
	   - Made CONT (contintent) compulsory within REGION
04/29/05   - Added new elements CAREER STAGE, DISCIPLINE to PUBFM for naturejobs article classification.
03/31/05   - Added new attribute online to TYPE attribute on PUBDATE. This is for online-only content.
	   - Added new elements CAREER STAGE, DISCIPLINE to PUBFM for naturejobs article classification.
03/10/05   - Created optional WIDTH and HEIGHT attributes on weblink element for specifying custom width/height measurements on target 
	   windows. Should only be used to override standard dimensions in special cases.
	   - Added new element FLMREVIEW to BDY to support Film Reviews in NBT. Based on BKREVIEW element. ID will use naming convention 
	   'FM#' and must match RID on RVWINFO element. <rvwinfo rid="fm1">....</rvwinfo><flmreview id="fm1">...</flmreview>	   
02/07/05   - Added SBML to %notation parameter entity to support structured data suppinfo in MSB
	   - Created new element SYNOPSIS and HIGHLTS at the ABS level within FM.
01/06/05   - Added "geo" to TYPE attribute on ACCESSION element.
01/05/05   - Changed nataminc.ent callout to nataminc_x.ent to reflect XML status.
12/07/04   - Added new %npgnonchars; parameter entity which points to external entity file npgnonchars.ent (New DTD file).
	   Npgnonchars.ent created to contain NPG custom non-character/boilerplate text entities. Npgnonchars.ent is 
	   SGML/XML valid and is called from both XML and SGML dtds.
	   - Defined new entity &newsad; within npgnonchars.ent for standard news ad includes. Entity contains standard 
	   path to news ad.
	   - Added TYPE values: special | max | box to WEBLINK for special formatting requirements on popup windows.
	   - Added new element REFDOI to REFTXT for hardcoded DOIs when DOI is not yet available in database and Editorial 
	   can't wait for it - should not be used unless absolutely necessary. Contents of REFDOI is PCDATA.
	   Created new parameter entity %REFTXT containing common element shared between BIB and CITE. Changed BIB and 
	   CITE content to contain %reftxt; instead of duplicate element lists.
11/17/04   Added new element BLOGREF to AU, AUNAME and CAU to associate authors with their respective BLOGENTRY 
	   (if applicable).
	   Added optional ID attribute to BLOGENTRY to act as target for BLOGREF.
11/01/04   Added new attribute ORIGSRC to ARTICLE with implied/default value of "yes". ORIGSRC=NO only used when JTL 
	   (journal title) is not the original source journal for that article. (Used only for NCP journals at present)
10/04/04   Added %data; to CHGMADE.	
09/27/04   Added new value "ORIG" to TYPE attribute on CITE for Original article citations on NCP articles.
	   Allowed TERM within %data; for NCP glossary terms which can appear throughout article body.
	   Added new optional GLOSSID attribute to TERM for NCP glossary terms. GLOSSID should resolve to a glossary definition held in an external database.
	   Allowed new elements MATS and PROC within BDY for new Materials and Procedures sections in NMeth Protocol articles.  
	   Created new element MATSGRP within MAT for groups of materials.
	   Created new atttribute CAUTION on MAT element. Allowable values: 'yes' or 'no' (default).
	   Created new element PROCGRP and STEP within PROC for groups of steps and individual steps.
	   Allowed P, and new elements CRITICAL (critical notes), TROUBLE (troubleshooting), PAUSE  (pause point notes) within STEP.
	   Within TROUBLE created new elements: PROBLEM and SOLUTION.
  
07/15/04   Added optional TITLE to BLOGENTRY.
	   Added new value "BIND" to TYPE attribute on ACCESSION.
06/28/04   Added "c" to the list of allowable %notation values for supplement objects.
	   Replaced PCDATA with %data; in PULLQUOTE to allow more text control.
05/24/04   Added new element BLOGENTRY to BDY to support new News@Nature blog entries for "blog" articles. BLOGENTRY
	   contains required element ENTRYDATE and at least one P. ENTRYDATE carries 5 required attriutes (year, month,
	   day, day number [e.g. Day 1], time).
05/14/04   Added new TIME attribute to PUBDATE and CHGDATE for news@nature articles. Format of time should be 24hr time
	   and include time zone abbreviation. E.g. time="17:00GMT"
02/26/04   Added new TYPE attribute to BX element with possible values of "reg" (Regular boxes. Default - if not specified, 
	   assumed) or "bio" (special "Author Biography" boxes in NRD "20 Questions" articles that need to be distinguished from
	   regular boxes.)
02/20/04   Added MP3 to %notation;
	   Added new sub category "ca" for Communication Arising online articles (sub category of Brief Communication)
	   Added new category "20q" for 20 Questions NRDD articles
1/28/04    Created new category "HN" for "Historical News"
	   Created new optional attribute "COUNTRY" on ISBN with possible values of "us, uk, ja" for new amazon book links on Nature.
1/15/04    Added optional TITLE to SUPPOBJ.
	   Added new DISPLAY attribute to ILLUS to control print vs online display of images. Possible values: "print-only" 		
	   "online-only" "print-online" (default).
11/03/03   Added "mp4" to %notation. Becomes new value for FORMAT attribute on SUPPOBJ and MEDIA.
10/28/03   Created new subcategories: "course" (course), diary (diary) 
10/17/03   Following changes made to accomodate new Vital magazine:
	   Created new element PRF (profession - e.g. Dental Nurse) and allowed within %ADDRESS;
	   Created new categories: "strle" (Star Letter), onyrft (On Your Feet), clin (Clinical), lstwrd (Last Word)
	   Created new subcategories: "mp" (Marketplace), "crsswrd" (Crossword), "lstwrd" (Last Word) 
	   Created new attribute "placement" on BX with types of either "internal" or "external" (external being default) for boxes that appear on the internal article page, not a separate external box page.
	   Added ADDRESS to CONTACT to accomodate lists of address and contact info 
10/01/03   Extracted %CATEG and %SUBCAT and placed in external file called  NPGCATEG.MOD.  
09/16/03   Made TBLIMG optional within %tabl.
09/16/03   Created 17 subject codes for EMBO journal. These codes will be values for the CODE attribute on the SUBJECT element:

	   Embocode-1	Development
	   Embocode-2	Proteins
 	   Embocode-3	Immunology
	   Embocode-4	Cellular Metabolism
	   Embocode-5	Neuroscience
	   Embocode-6	Signal Transduction
	   Embocode-7	Plant Biology
	   Embocode-8	Cell Cycle
	   Embocode-9	Structural Biology
	   Embocode-10	Differentiation &amp; Death
	   Embocode-11	Computational Biology
	   Embocode-12	Membranes &amp; Transport
	   Embocode-13	Genome Stability &amp; Dynamics
	   Embocode-14	Microbiology &amp; Pathogens
	   Embocode-15	Chromatin &amp; Transcription
	   Embocode-16	Molecular Biology of Disease
	   Embocode-17	RNA

09/08/03   Add new CATEG IDs for Nature Reviews Microbiology: gw (Genome Watch) and dw (Disease Watch).
09/02/03   Created new optional element SUBFIG within FIG for single figures made up of multiple graphics. SUBFIG is an 
	   empty element and carries the ENTNAME and TYPE attributes.
09/02/03   Added optional NUMBER attribute to BXTITLE for print purposes.
08/25/03   Added optional DOI to SUPPFM (as in PUBFM).
08/20/03   Created new optional element SHORTATL for shortened version of the article title. Used when ATL is too long for certain
	   uses. E.g. EMBO J contains list of article titles, shortened article titles are preferred when full title is overly long.
07/15/03   Removed all EXT-ID attributes from COMPANY and PROD
	   Changed all INT-ID attributes on COMPANY and PROD to ID
	   Added required ID attribute to BRANDNAME.
	   Added optional NAME attribute to PROD to hold full product name when product name in body text is ambiguous.
07/10/03   Created following new CATEG IDs for EMBO journal:
	   member review 'memrv'
	   medal review 'medrv'
	   EMBO workshop report 'ewr'
	   EMBO members review 'emr'
	   New member review 'nmr'
	   New EMBO members review 'nemr'
	   EMBO conference report 'ecr'
06/19/03   Created new CATEG ID "conc" for Nature category "Concepts". Was previously a CATEGTXT value.
06/12/03   Changed ID attribute on PROD and COMPANY to INT-ID for "internal" pre-processed biocompare Ids/EXT-ID for 
	   "external" post-processed biocompare Ids.
	   Changed COMPANYID attribute to INT-COMPID on PROD for "internal" pre-processed biocompare Id references/EXT-COMPID for 
	   "external" post-processed biocompare Ids.
	   For the new subject Broad Areas and Sub Classifications for nature papers, created the following allowable values
	   for the CODE attribute on SUBJECT:
	   
	   natcode-1 = Biology
	   natcode-2 = Biochemistry
	   natcode-3 = Bioinformatics
	   natcode-4 = Biophysics
	   natcode-5 = Biotechnology
	   natcode-6 = Cancer Research/ Oncology
	   natcode-7 = Cardiovascular Biology
	   natcode-8 = Cell Biology
	   natcode-9 = Conservation Biology
	   natcode-10 = Development
	   natcode-11 = Drug Discovery
	   natcode-12 = Ecology
	   natcode-13 = Evolution
	   natcode-14 = Genetics
	   natcode-15 = Genomics
	   natcode-16 = Immunology
	   natcode-17 = Medicine
	   natcode-18 = Microbiology
	   natcode-19 = Molecular Biology
	   natcode-20 = Neurosciences
	   natcode-21 = Proteomics
	   natcode-22 = Pharmacology
	   natcode-23 = Physiology
	   natcode-24 = Plant Science
	   natcode-25 = Structural Biology
	   natcode-26 = Palentology
	   natcode-27 = Physics
	   natcode-28 = Astronomy
	   natcode-29 = Materials
	   natcode-30 = Chemistry
	   natcode-31 = Earth and Environmental Sci
	   natcode-32 = Engineering/Applied Physics
	   natcode-33 = No paid

	   In addition to above, also created new element SUBCLASS with required attribute CLASS for nature sub classifications:
	   
	   natclass-1 = Amino Acids
	   natclass-2 = Antibodies
	   natclass-3 = Antisense
	   natclass-4 = Apoptosis
	   natclass-5 = Cell/Tissue Culture
	   natclass-6 = Chromatography
	   natclass-7 = Crystallography/ NMR
	   natclass-8 = Cryogenics/Vacuum Equipment
	   natclass-9 = Cytokines
	   natclass-10 = Diagnostics
	   natclass-11 = Cloning
	   natclass-12 = DNA Polymerase
	   natclass-13 = DNA Sequencing
	   natclass-14 = Electrophoresis
	   natclass-15 = Fluorometry
	   natclass-16 = Functional Genomics
	   natclass-17 = Gene Expression
	   natclass-18 = Gene Therapy
	   natclass-19 = Genotyping
	   natclass-20 = High Throughput Screening (HTS)
	   natclass-21 = HPLC Analysis tools
	   natclass-22 = Image Analysis
	   natclass-23 = Immunoassays
	   natclass-24 = Lab Automation
	   natclass-25 = Lasers/Optics
	   natclass-26 = Mass Spectrometry
	   natclass-27 = Microarrays
	   natclass-28 = Microscopy
	   natclass-29 = Nucleic Acids
	   natclass-30 = Oligonucleotides
	   natclass-31 = PCR
	   natclass-32 = Peptide Mapping & Sequencing
	   natclass-33 = Pharmacogenomics
	   natclass-34 = Protein Expression
	   natclass-35 = Recombinant Proteins
	   natclass-36 = RNAi
	   natclass-37 = Scientific Software
	   natclass-38 = Sequencing
	   natclass-39 = Signal Transduction
	   natclass-40 = SNP
	   natclass-41 = Thermocyclers
	   natclass-42 = Transfection
	   
05/27/03   Created new CATEG ID "opcom" for nbt category "Opinion and Comment".	
05/05/03   Allowed LIST within LI
04/30/03   Removed FN from TGROUP (CalsTbl.dtd)
	   Allowed FN within ENTRY
04/29/03   Added file attribute to illus, fig and mathimg (print purposes)
	   Added number attribute to bibr, bib, figtl, caption, table (print purposes)
	   Removed all instances of LISTR, removed LIST from OBJECTS and BOX, allowed LIST within P
	   Created sew SUBCATEG ID "le" for NBT sub category "Letters"
	   Created sew CATEG ID "nvb" for Nature category "News & Views in Brief"
	   
04/04/03   Created new CATEG ID "ba" for Nature category "Books and Arts".
03/26/03   Removed GROUPWRAP, created new element called GROUP and added it to AUG within the AU | CAU selection. 
	   Inside of GROUP there is the option of a nested group or a GROUPTTL followed by optional GROUPTXT and AUs or CAUs.

2/06/03    Created the following new CATEG IDs for new Research Journal redesign:
	   "tr" (Technology Reports)
	   "swr" (Software Review)
	   "thtr" (Theater Review)
	   "jr" (Journal Review)
	   "multr" (Multimedia Review)
	   "tvr" (Television Review)
	   "pro" (Profile)
	   "hc" (Historical Commentary)
	   "biov" (Biovision)
	   "spfwd" (Sponsor's Foreword)
	   "timeln" (Timeline)
	   
	   And the following new SUBCATEG IDs:
	   "nbr" (News in Brief)
	   "nf" (News Feature)
  	   "rnts" (Research Notes)	   
    	   "nvf" (News and Views Feature)
  	   "pe" (Perspective)
     	   "bc" (Brief Communications)
      	   "cg" (Corrigenda)
       	   "add" (Addenda)
       	   "ret" (Retraction)
       	   
1/22/03    Created new SUBCATEG ID "pro" for EMBO article type "Profile".
12/30/02   Created new CATEG ID "lfln" for NRD article feature "Lifeline".
12/06/02   Created new CATEG ID "fpln" for new NRD article type "Fresh from the pipleline". Will be featured in each issue 
	   from Jan 2003 onwards.
11/14/0    Added new DOI element to PUBFM to hold entire DOI for the article. DOI will no longer be auto-generated.
10/09/02   Created the following new categories (%categ;) for EMBO Reports: "ss" (Science and Society), 
	   "sr" (Scientific Reports). 
	   
	   Created the following new sub categories (%subcat;) for EMBO REPORTS: "qf" (Quite Frankly), "vp" (Viewpoint), "intvw" (Interview), "mr" (Meeting Report), "lr" (Literature Report), "con" 
	   (Concept), "rvs" (Reviews), "crg" (Corrigendum).
	   
	   Added new element PULLQUOTER (pullquote reference) to %EMPTYREF;. PULLQUOTER is an empty 
	   placeholder element which is used to reference a PULLQUOTE in EMBO Reports via the RID
	   attribute. RID naming convention is "PQ#".
	   
	   Added new element PULLQUOTE (pull quote) to OBJECTS. PULLQUOTE is used to contain floating, 
	   quoted text in EMBO Reports and is the target for PULLQUOTER via the ID attribute. ID naming 
	   convention is "PQ#".
	   
09/19/02   Allowed %FONTCHG; within PROD, COMPANY and BRANDNAME to accomodate changes in text display.
08/27/02   Added new SUBCAT ID "prog" for "Progress" articles in Nature Materials.
08/20/02   Added the attribute "extrefid" to the element CITE for citations that refer to articles that share a page with other articles. Because the automatic link creation process is based largely on cited page numbers, the builder can't identify which article the citation is referring to when more than one article exists on that page. In these cases, the builder will generate a messsage reporting the ambiguous citation and the electronic  production can then supply the UID of the target article as the value of the extrefid attribute.
08/20/02   Changed attribute "nmatcode" to "code" as these subjects will not be used exclusively for Nature Materials and 
	   may appear in future titles.
08/20/02   Added new CATEG ID "ethicsw" for "Ethics Watch" category in Nature Reviews Genetics.
08/14/02   Added new CATEG ID "thismo" for "This Month" category which will appear in Nature Materials.
07/19/02   Added the new element SUBJECT to PUBFM and SUPPFM to accomodate Nature Materials "subjects". SUBJECT contains 		   NMATCODE attribute with possible numerical values of 1-30 which are translated by the HTML builders to the 	   	   appropriate subject heading:

		nmatcode-1 = Metals & alloy
		nmatcode-2 = Ceramics
		nmatcode-3 = Composites
		nmatcode-4 = Glasses
		nmatcode-5 = Colloids
		nmatcode-6 = Liquid crystals
		nmatcode-7 = Polymers
		nmatcode-8 = Complex fluids
		nmatcode-9 = Biological materials
		nmatcode-10 = Biomedical materials
		nmatcode-11 = Structural materials
		nmatcode-12 = Electronic materials
		nmatcode-13 = Molecular electronics
		nmatcode-14 = Semiconductors
		nmatcode-15 = Optical, photonic and optoelectronic materials
		nmatcode-16 = Magnetic materials
		nmatcode-17 = Superconductors
		nmatcode-18 = Geomaterials 
		nmatcode-19 = Mechanical properties
		nmatcode-20 = Granular materials and particle technology
		nmatcode-21 = Catalytic materials
		nmatcode-22 = Separation materials
		nmatcode-23 = Sensors and biosensors
		nmatcode-24 = Materials for energy
		nmatcode-25 = Nanoscale materials 
		nmatcode-26 = Porous materials 
		nmatcode-27 = Surface and thin films
		nmatcode-28 = Design synthesis and processing
		nmatcode-29 = Characterisation and analytical techniques
		nmatcode-30 = Computation, modelling and theory

07/18/02   	Created new element KEYWORDGRP for keywords within Nature materials articles. These keywords will be used for web 
	   	searches and transferred to META tags upon HTML translation. KEYWORDGRP is made up of one or more KEYWORD and is 		   optionally allowed within PUBFM and SUPPFM.
07/18/02   	Added the following new id to %SUBCAT; for repeatedly used subcategory in Nature Materials: matwit ("Materials 		   Witness")

07/09/02   	Added the following new ids to %CATEG for repeatedly used categories: bks (Book Review), brn (Business and 
	   	Regulatory News), highlts (Highlights), natview (Naureview), iniss (In this Issue), trialw (Trial Watch), 
	   	stw (Structure Watch), pw (Patent Watch), couch (From the Analyst's Couch), hyp (Hypothesis), ru (Round-up), 
		pa (Poster Abstracts), nf (News Feature).
	        Added the following new ids to %SUBCAT for repeatedly used sub categories: an (Analysis), fc (Fool's Corner), 
		ib (In Brief), nm (New On the Market)
07/03/02   	Created new elements COMPANY, PROD and BRANDNAME within %DATA; to facilitate Bio Compare linking 		project.COMPANY requires "id" atttribute which acts as target for required "companyid" attribute on PROD.
06/12/02   	Created new attribute TYPE on element ISSN. Possible values are "electronic" and "print". Made ISSN 'one or 
		more' 
	   	within PUBFM, PARENT and PUBINFO. Changes were made to support "dual issn's" - print and electronic - 		currently being used for the Reviews and eventually the Research titles and Nature.
05/29/02 	All default attribute values were quoted as per XML requirements.
		
		XML does not support tag minimizations (Unclosed start-tags, Unclosed end-tags etc.) All instances of "- -" "- o" "o o" "o -" were removed.
		XML does not support NUMBER(S), NUTOKEN, CDATAS and NAME type attribute values. These were all replaced with CDATA.
		
		XML does not support SDATA entitities. SDATA removed from Nataminc SGML Entities
		
		XML does not support inline comments within an entity declaration. Inline comments were placed outside in external comments.
		
		XML does not support Exclusion models. E.g. In the CalsTbl.dtd: <!ELEMENT table (%tabl;)   -(table) >. All Exclusions were removed.
		
		Processing instruction <?SDATRANS> was removed as XML requires default attributes to be a literal value.
		
		XML does not allow spaces within attribute values as within the SDAFORM, SDARULE, SDAPREF, SDASUFF, SDASUSP attributes in ISO Math dtd. Any spaces were removed. Commented out definitions and uses of SDAFORM, SDARULE, SDAPREF, SDASUFF, SDASUSP as they are not used for NPG
		
		XML imposes rules on Mixed Content Models. #PCDATA must occur first in list of unordered elements. Revised mixed content models accordingly.
		
		XML syntax for defining parameter entities for elements cannot contain parenthesis. Parenthesis removed.

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type (erratum | correctn | retraction | addendum | corrig) #IMPLIED
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id ID #REQUIRED
>
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url CDATA #IMPLIED
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filesize CDATA #IMPLIED
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<!ELEMENT descrip (p+)>

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<!ELEMENT autxt (%data;)*>
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<!ELEMENT ttl (%data;)*>
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<!ELEMENT pubaug (%text; | pubau)*>
<!ELEMENT pubau (%author;)*>
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<!ELEMENT publshr (%text;)*>
<!ELEMENT pubaddr (%address;)*>
<!ELEMENT brpubdate (%text;)*>
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<!-- HR: Contributors element stemming from the dublin core metadata element of the same name which is used for significant contributors to the content, secondary to the main author/creator of the content (e.g. interviewer, interviewee, translator etc.) -->
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role CDATA #IMPLIED >

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<!-- HR: Group element for author consortiums. Groups normally contain group title and list of authors or nested group. Though sometimes 
only the group/consortium name is provided -->
<!-- contrib-level is now deprecated, now use role -->
<!-- new attribute "role" to describe contribution of group to article, values of "author" and "contributor" allowed -->

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<!ELEMENT grouptxt (%data;)*>

<!-- Use "x1", "x2" etc. as 'rid' values for correspondence to <corres>. -->
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id ID #REQUIRED
refchar %refchars; #IMPLIED
>
<!-- Added AUFN to be used in situations where information is placed in the AFF section which does not pertain to one more author's affiliations, such as straight PCDATA.  To be used in conjunction with AUFNR which will be where the PCDATA will be housed. -->
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<!--AUNAME to be used when an author has no affiliation.-->
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>
<!-- BLOGREF to be used to associate author with specific BLOGENTRY -->
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>
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>
<!ELEMENT audeclr EMPTY>
<!ATTLIST audeclr
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refchar %refchars; #IMPLIED
>

<!ELEMENT role (%plain-text;)* >

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refchar %refchars; #IMPLIED
>

<!ELEMENT auid EMPTY>
<!ATTLIST auid
    type CDATA #REQUIRED
    id CDATA #REQUIRED > 

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>
<!ELEMENT replyau (fnm?, snm, autxt?, suff?, ttl?, inits?, (orf | corf)*)>
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<!ELEMENT hst (created?, re?, rv?, acc?, misc?, pubdate*)>

<!ELEMENT created EMPTY>
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month CDATA #REQUIRED
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hour CDATA #IMPLIED
minute CDATA #IMPLIED
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<!ELEMENT re EMPTY>
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year CDATA #REQUIRED
month CDATA #REQUIRED
day CDATA #IMPLIED
>
<!ELEMENT rv EMPTY>
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year CDATA #REQUIRED
month CDATA #REQUIRED
day CDATA #IMPLIED
>
<!ELEMENT acc EMPTY>
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month CDATA #REQUIRED
day CDATA #IMPLIED
>
<!ELEMENT misc (#PCDATA)>
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year CDATA #REQUIRED
month CDATA #REQUIRED
day CDATA #IMPLIED
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<!ELEMENT pubdate EMPTY>
<!ATTLIST pubdate
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%dateatt;
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hour CDATA #IMPLIED
minute CDATA #IMPLIED
>
<!ELEMENT chghst (chg)+>
<!ELEMENT chg (chgperson?, chgdate, chgloc, chgmade, chgreason?)>
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>
<!ELEMENT chgperson (fnm, snm)>
<!ELEMENT chgdate EMPTY>
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time CDATA #IMPLIED
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<!ELEMENT chgloc (#PCDATA)>
<!ELEMENT chgmade (%data;)*>
<!ELEMENT chgreason (#PCDATA)>
<!ELEMENT abs (p+)>
<!ELEMENT p (%data; | f | fd | dformgrp | cite | contact | list)*>

<!ELEMENT cite (%reftxt;)*>
<!ATTLIST cite
id ID #REQUIRED
type CDATA  #IMPLIED
extrefid  CDATA  #IMPLIED
display (true | false) "true"
>

<!ELEMENT code (%plain-text; | %controls;)*>
<!ATTLIST code 
id ID #IMPLIED
type CDATA #IMPLIED
language CDATA #IMPLIED
display (inline | block) "block"
>


<!ELEMENT refau (%data; | fnm | snm | suff | ttl | auid)*>
<!ELEMENT btl (%data;)*>
<!ELEMENT iid (%data;)*>
<!ELEMENT vid (%data;)*>
<!ELEMENT ppf (%data;)*>
<!ELEMENT ppl (%data;)*>
<!ELEMENT cd (#PCDATA)>
<!ATTLIST cd
year CDATA #REQUIRED
month CDATA #IMPLIED
day CDATA #IMPLIED
>
<!ELEMENT medline (#PCDATA)>
<!-- HR: Display attribute was added to control display/suppression of REFDOIs in citations and references. Occasionally REFDOIs are 
inserted force resolution of a citation/reference and are not part of the original text. These  would be suppressed/hidden. Otherwise, default rule is to Show -->
<!ELEMENT refdoi (#PCDATA)>
<!ATTLIST refdoi
display (show | hide) "show">

<!ELEMENT article-number (#PCDATA)>

<!ELEMENT doc-id (#PCDATA)>

<!ELEMENT contact (%data; | address | name | phone | fax | rsn)*>
<!ELEMENT name (%data;)*>
<!ELEMENT phone (%data;)*>
<!ELEMENT fax (%data;)*>
<!-- RSN stands for "Reader Service Number." -->
<!ELEMENT rsn (%data;)*>
<!ELEMENT stndfrst (%data;)*>
<!--A "standfirst" is an article summary, *not* a true abstract, that appears
 both in print and online.-->
<!ELEMENT websumm (%data; | dateline)*>
<!ATTLIST websumm
type 	(toc | regular) "regular"
>

<!--A "web summary" is an article summary, usually an abridged version of the
 first paragraph, restricted to online delivery.-->
<!ELEMENT execsumm (p+)>
<!--A "web summary" is an article summary, *not* a true abstract, restricted to online
 delivery and used for the Nature Reviews series.-->
<!ELEMENT synopsis (p+)>
<!--A "synopsis" is an article overview, *not* a true abstract, restricted to online delivery and is not displayed on the full text article.-->
<!ELEMENT highlts (p+)>
<!--A "highlights" is a list of article highlights, restricted to online delivery and is only displayed with the synopsis, does not appear on the full text article -->
<!ELEMENT edsumm (title, p+)>
<!ATTLIST edsumm
type 	(standfirst | regular) "regular"
publish (issue | aop) "issue"
>

<!--A "editorial summary" is an article summary restricted to online delivery and is only displayed on the editorial summary page with the associated article(s), does not appear on the full text article -->

<!ELEMENT kwdg (kwd+)>
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class CDATA #IMPLIED
>
<!ELEMENT kwd (%keyword;)*>
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%glossid;
>

<!ELEMENT bdy ((greeting | fp | bio | dateline | illusr | chemimgr | quote)*, ((p | sec | crosshd | blogentry | mats | proc | intvw | quiz | ext-media)+ | (bkreview | flmreview | artsreview | exhibitreview)+ | corres+ | market)?, reply*, addendum?)>
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<!ELEMENT fp (p+)>
<!ELEMENT bio (p | crosshd)+>
<!ELEMENT crosshd (%data; | crossttl | f)*>
<!ELEMENT crossttl  (%data; | f)*>
<!-- "Blog Entry" used for Blog articles only -->
<!ELEMENT blogentry (entrydate, title?, p+)>
<!-- BLOGENTRY ID target for BLOGREF. Used to associate authors with individual blog entries. --> 
<!ATTLIST blogentry
id ID #IMPLIED
>
<!-- "Entry Date" used to log entry date and time of Blog entries -->
<!ELEMENT entrydate EMPTY>
<!ATTLIST entrydate
%dateatt;
daynum CDATA #REQUIRED
time CDATA #IMPLIED>

<!ELEMENT dateline (%text;)*>

<!ELEMENT mats		(matsgrp)+>

<!-- "matsec" added to allow subheadings within Reagents and Equipment XB-1234 -->
<!ELEMENT matsgrp	(title, (critical | caution)*, (mat | matsec)+)>

<!ELEMENT matsec (title, mat+)>

<!ELEMENT mat		(p | critical | caution | timing | trouble)+>
<!ATTLIST mat		caution (yes | no) "no">

<!ELEMENT proc		((critical | caution)*, (procgrp | step)+, timing?) >

<!ELEMENT procgrp	(title, (critical | caution)*, step+, timing?) >

<!ELEMENT step		((p | pause | trouble | critical | caution | step)+, timing?)>

<!ELEMENT critical	(p)+>

<!ELEMENT trouble	((problem, solution)+ | (p+))>

<!ELEMENT problem	(p)+>

<!ELEMENT solution	(p)+>

<!ELEMENT pause		(p)+>
<!-- PD - added %data here -->
<!ELEMENT timing	(%data; | timing)*>

<!ELEMENT caution	(%data;)*>

<!ELEMENT intvw		(qa-block)+>

<!ELEMENT qa-block	(question, answer)>

<!ELEMENT question	(p)+>

<!ELEMENT answer	(p | crosshd)+>

<!ELEMENT quiz		(qa-block)+>

<!ELEMENT sec (sectitle, dateline?, (p | crosshd | online-methods | ext-media)*, (sec, (sec | ext-media)*)?)>
<!ATTLIST sec
level CDATA #REQUIRED
id ID #IMPLIED
type (excerpt) #IMPLIED
>
<!ELEMENT sectitle (%data; | f)*>

<!-- HR: Online Methods section -->
<!ELEMENT online-methods (p | sec)+>

<!-- external media -->
<!ELEMENT ext-media (meta)*> 

<!ATTLIST ext-media 
id ID #IMPLIED 
type CDATA #REQUIRED 
url CDATA #IMPLIED 
> 

<!ELEMENT bkreview (p+)>
<!ATTLIST bkreview
id ID #REQUIRED
>
<!-- HR:  Film review content -->
<!ELEMENT flmreview (p+)>
<!ATTLIST flmreview
id ID #REQUIRED
>

<!-- HR:  Arts review content -->
<!ELEMENT artsreview (p+)>
<!ATTLIST artsreview
id ID #REQUIRED
type CDATA #IMPLIED
>

<!-- HR:  Exhibition review content -->
<!ELEMENT exhibitreview (p+)>
<!ATTLIST exhibitreview
id ID #REQUIRED
>

<!ELEMENT corres (greeting?, pubdate, (p | crosshd)+, aug, bm?)>
<!ATTLIST corres
id ID #REQUIRED
>
<!-- Use "x1", "x2" etc. as 'id' values for correspondence to <aug>. -->
<!ELEMENT market (crosshd | product)+>
<!ELEMENT product (prodttl | contact | summary | prddescr)+>
<!-- Alternately, SUMMARY could be moved from PRODUCT to PRDDESCR. -->
<!ELEMENT prodttl (%text;)*>
<!ELEMENT summary (%text;)*>
<!ELEMENT prddescr (p+)>
<!ELEMENT reply (greeting?, (p | crosshd)+, bm?)>
<!ATTLIST reply
id ID #IMPLIED
>
<!ELEMENT addendum (crosshd?, p+)>
<!ELEMENT bm (endnote*, objects?, annotations?, accesgrp?, data-citations?, ack?, audecl*, app?, author-info?, bibl?, vita?)>
<!ELEMENT endnote (%text; | p)*>
<!--Floating Elements -->
<!ELEMENT objects (table | fig | illus | image | infographic | deflist | bx | notes | linkgrp | media | pullquote | scheme | compound | chemimg | ext-media | slideshow)*>

<!ELEMENT slideshow (title?, caption?, (fig | illus | infographic)+) >
<!ATTLIST slideshow id ID #REQUIRED >

<!ELEMENT fig (subfig*, slide?, datafile*, figtl?, caption?, figfn?, credit?)>
<!ATTLIST fig
id ID #REQUIRED
type %notation; "bmp"
entname CDATA #IMPLIED
entref IDREF #IMPLIED
file CDATA #IMPLIED
fig-type (box-figure | suppinfo) #IMPLIED
>

<!ELEMENT subfig    EMPTY>
<!ATTLIST subfig    type  %notation; "bmp"
                    entname  CDATA  #IMPLIED
                    entref IDREF #IMPLIED>                    

<!ELEMENT slide	EMPTY>
<!ATTLIST slide	entname CDATA #IMPLIED
                entref IDREF #IMPLIED>

<!ELEMENT datafile (label?)>
<!ATTLIST datafile type %figure-data; "xls"
                    datafile-type (figure-data | interactive) "figure-data"
                    url CDATA #IMPLIED
                    entname CDATA #IMPLIED
                    entref IDREF #IMPLIED>


<!ELEMENT figtl (%data; | f)*>
<!ATTLIST figtl number CDATA #IMPLIED>
<!ELEMENT caption (p+)>
<!ATTLIST caption number CDATA #IMPLIED>
<!ELEMENT figfn (%data;)*>
<!ELEMENT credit (%data;)*>

<!ELEMENT illus (title?, caption?, credit*, url?, image-alt?, alt-image*)>

<!ATTLIST illus
id ID #REQUIRED
type %notation; "bmp"
entname CDATA #IMPLIED
entref IDREF #IMPLIED
embed (yes | no) "yes"
file CDATA #IMPLIED
display (print-only | online-only | print-online) "print-online"
illus-type (illustration | infographic) "illustration"
>

<!-- new element alt-image to hold alternative versions (normally different sizes) of the parent image
   it inherits the other properties (title, caption, credit, url, image-alt) from its parent -->

<!ELEMENT alt-image EMPTY>
<!ATTLIST alt-image
type %notation; "bmp"
entname CDATA #IMPLIED
entref IDREF #IMPLIED
relation (full-size | thumbnail) #REQUIRED
>

<!ELEMENT image (caption?, url?, image-alt?)>
<!ATTLIST image 
role (sponsor | product) #IMPLIED
type %notation; "bmp"
entname CDATA #IMPLIED
entref IDREF #IMPLIED
>

<!ELEMENT image-alt (#PCDATA)>

<!ELEMENT infographic (title?, caption?, credit*)>
<!ATTLIST infographic
id ID #REQUIRED
type %notation; "bmp"
entname CDATA #IMPLIED
entref IDREF #IMPLIED
file CDATA #IMPLIED
>

<!ELEMENT list (li+)>
<!ATTLIST list
id ID #REQUIRED
type (bullet | number | ucletter | lcletter | ucroman | lcroman) "bullet"
>
<!ELEMENT li (%data; | cite | f | list | critical | trouble | caution | pause | timing)*>
<!ELEMENT deflist (listttl?, (term, defn)+)>
<!ATTLIST deflist
id ID #REQUIRED
type (unenum | bullet | balbox | number | lcletter) "unenum"
name (glossary) #IMPLIED
sepch CDATA " "
colwd CDATA "1 5"
>
<!--From ARTCOL.DTD: Use 'sepch' to specify a character between TERM and DEFN.
 Use 'colwd' to specify relative TERM/DEFN column widths.-->
<!ELEMENT listttl (%data; | f)*>
<!ELEMENT term (%data; | f | fd)*>
<!ATTLIST term
%glossid;
>
<!ELEMENT defn (p+)>
<!ELEMENT bx (bxtitle?, stndfrst?, (p | deflist | illus | table | critical | trouble | caution | pause | timing)+, byline?)>
<!ATTLIST bx
        id ID #REQUIRED
        placement (internal | external) "external"
        type (bio | reg) "reg"
>

<!ELEMENT bxtitle (%data; | f)*>
<!ATTLIST bxtitle number CDATA #IMPLIED>
<!ELEMENT byline (%data;)*>
<!ELEMENT notes (fn+)>
<!ELEMENT linkgrp (linkset+)>
<!ELEMENT linkset (weblink+ | linksubset+)+>
<!ATTLIST linkset
name CDATA #IMPLIED
>
<!ELEMENT linksubset (weblink+)>
<!ATTLIST linksubset
name CDATA #IMPLIED
>
<!ELEMENT media (figtl?, caption?, figfn?, credit?, illus?, code*)>
<!ATTLIST media
id ID #REQUIRED
type %notation; #IMPLIED
height CDATA #IMPLIED
width CDATA #IMPLIED
entname CDATA #IMPLIED
entref IDREF #IMPLIED
>

<!ELEMENT quote (%data; | statedby | aff)*>
<!ATTLIST quote
id ID #IMPLIED
type CDATA #REQUIRED
>

<!ELEMENT pullquote (%data; | statedby | aff)*>
<!ATTLIST pullquote id ID #REQUIRED>

<!ELEMENT statedby (#PCDATA)>

<!-- HR: Scheme -->
<!ELEMENT scheme (schemetl?, caption?)>
<!ATTLIST scheme
id ID #REQUIRED
type %notation; "bmp"
entname CDATA #IMPLIED
entref IDREF #IMPLIED
>

<!-- HR: Scheme title -->
<!ELEMENT schemetl (%data;)*>

<!-- HR: Compound -->
<!ELEMENT compound (label, name, synonym*, chemical-formula?, mol-weight?, elemental-analysis?, inchi*, inchikey*, smiles?, compound-obj*, meta*)>
<!ATTLIST compound
id ID #REQUIRED
sid CDATA #IMPLIED
csid CDATA #IMPLIED
entname CDATA #IMPLIED
entref IDREF #IMPLIED
>

<!-- HR: Compound label - e.g. 7b -->
<!ELEMENT label (%data;)*>

<!ELEMENT synonym             (%data;)*>
<!ELEMENT chemical-formula    (%plain-text;)*>
<!ELEMENT mol-weight          (#PCDATA)>
<!ELEMENT elemental-analysis  (#PCDATA)>
<!ELEMENT inchi               (#PCDATA)>
<!ATTLIST inchi         type CDATA #IMPLIED>
<!ELEMENT inchikey            (#PCDATA)>
<!ATTLIST inchikey      type CDATA #IMPLIED>
<!ELEMENT smiles              (#PCDATA)>


<!ELEMENT compound-obj (title?)>
<!ATTLIST compound-obj
extrefid CDATA #REQUIRED
format %notation; #REQUIRED
filesize CDATA #IMPLIED
>

<!-- meta element added to allow extra information about chemical compounds to be created without requiring separate elements. -->
<!-- it can be extended to other uses -->
<!ELEMENT meta                (%data; | p | meta)* >
<!ATTLIST meta      property CDATA  #REQUIRED  >

<!-- CHEMIMG added to parallel MATHIMG in XML_Isomath.dtd and TBLIMG in CALSTBL.DTD --> 

<!ELEMENT chemimg         EMPTY>
<!ATTLIST chemimg  id ID #REQUIRED
          entname  CDATA  #IMPLIED
          entref IDREF #IMPLIED
          show  (yes | no)  "yes"
          file CDATA #IMPLIED>


<!-- at least one annotation must be present, annotation-compound is optional and repeatable -->
<!ELEMENT annotations (annotation | annotation-compound)*>

<!-- at least one annotation-item must be present; the same text can have more than one -->
<!ELEMENT annotation (annotation-item+)>
<!ATTLIST annotation id ID #REQUIRED>

<!-- only status attribute is optional; rid is of type IDREF; type indicates type of annotation -->
<!ELEMENT annotation-item EMPTY>
<!ATTLIST annotation-item
    id ID #REQUIRED
    type CDATA #REQUIRED
    rid IDREF #REQUIRED
    created-by CDATA #REQUIRED
    created  CDATA #REQUIRED
    updated  CDATA #IMPLIED
    status CDATA #IMPLIED    
>

<!-- id and inchi required; pubchem and chemspider default to "no" if unspecified -->
<!ELEMENT annotation-compound EMPTY>
<!ATTLIST annotation-compound
    id ID #REQUIRED
    title CDATA #REQUIRED
    inchi CDATA #IMPLIED
    inchikey CDATA #IMPLIED
    stdinchi CDATA #IMPLIED
    stdinchikey CDATA #IMPLIED
    pubchem CDATA #IMPLIED
    chemspider CDATA #IMPLIED
>

<!ELEMENT fn (p+)>
<!ATTLIST fn
id ID #REQUIRED
type (footnote | erratum | correctn) "footnote"
>
<!--End Floating Elements -->
<!ELEMENT accesgrp (access+)>
<!ELEMENT access (%data;)*>
<!ATTLIST access
categ (genbank | bnl | pdb) #REQUIRED
>
<!--"bnl" = Brookhaven National Laboratory; "pdb" = Protein Database-->
<!ELEMENT accession (%data;)*>
<!ATTLIST accession
		type (arrayexpress | bind | biomodels | bioproject | bmrb | ddbj | embl | emdb | ena | ensembl | est | genbank | geo | gss | mgi | nuccore | pcaid | pccid | pcsid | pdb | pride | sra | swiss-prot) "genbank"
status (primary | secondary) "secondary"
>

<!ELEMENT 	geneseq (%straight-text; | newline | %fontchng;)*>
<!ELEMENT 	proteinseq (%straight-text; | newline | %fontchng;)*>

<!-- Used for Company Disclaimers associated with Reviews articles -->
<!ELEMENT disclmr (p+, disclsr, address)>
<!-- Company Disclosure Information (Copyright statement and disclosure text) -->
<!ELEMENT disclsr (cd, p)>
<!-- Used to contain the address associated with the company disclaimer -->
<!ELEMENT address (%address;)*>

<!ELEMENT data-citations (data-citation)+>

<!ELEMENT data-citation (refau)*>
<!ATTLIST data-citation
db-name CDATA #REQUIRED
id CDATA #REQUIRED
url CDATA #IMPLIED
year CDATA #REQUIRED
source ( existing | new ) #IMPLIED
> 

<!ELEMENT ack (p+)>
<!ELEMENT audecl (explanatory?)>
<!ATTLIST audecl
id ID #IMPLIED
conflct (yes | no | decline | numerous | confidential) #REQUIRED
>
<!ELEMENT explanatory (%data;)*>
<!ELEMENT app (p | sec)+>
<!ELEMENT bibl (bib+ | bibgrp+)>
<!-- HR: Alternate Type attribute for Reference section, when Reference section should be treated slightly differently than normal as in 
Further Reading section when papers listed are not cited in paper but reference links still need to be created --> 
<!ATTLIST bibl
alt-type CDATA #IMPLIED
style (alpha | numero) "alpha"
>

<!ELEMENT bibgrp (heading, bib+)>
<!ELEMENT heading (#PCDATA)>
<!ELEMENT bib (reftxt*, natlink?)>
<!ATTLIST bib
id ID #REQUIRED
number CDATA #IMPLIED
type (orig | reg) "reg"
>
<!ELEMENT reftxt (%reftxt;)*>
<!ELEMENT vita (%data;)*>

<!-- HR: Back matter section for author information specifically -->
<!ELEMENT author-info (p+)>

<!-- New element to hold non-Unicode characters without using named entities -->
<!-- path: path from server root to image file; valign: vertical alignment as per CSS; 
     name: plain text form for HTML attribute values; class: CSS class for display; 
     entityname: name of original entity, e.g. "tacute" -->

<!ELEMENT character EMPTY>
<!ATTLIST character
	path CDATA #REQUIRED
	valign (baseline | bottom | middle | top) "middle"
	name CDATA #REQUIRED
	class CDATA "glyph"
	entityname CDATA #REQUIRED	
>

<!--Font changes -->
<!ELEMENT i (%data;)*>
<!-- Italics -->
<!ELEMENT b (%data;)*>
<!-- Bold -->
<!ELEMENT bi (%data;)*>
<!-- Bold Italics -->
<!ELEMENT un (%data;)*>
<!-- Underline -->
<!ELEMENT sc (%data;)*>
<!-- Small Caps -->
<!ELEMENT uc (%data;)*>
<!-- Upper case -->
<!ELEMENT up (%data;)*>
<!-- Upright, often followed by Greek -->
<!ELEMENT sl (%data;)*>
<!-- Sloping, often followed by Greek -->
<!ELEMENT du (%data;)*>
<!-- Double underline -->
<!ELEMENT ov (%data;)*>
<!-- Overline -->
<!ELEMENT super (%data;)*>
<!-- Superior in text -->
<!ELEMENT sub (%data;)*>
<!-- Inferior in text -->

<!-- HR: Container to hold content of a different language, must differ from language specified on the root element --> 
<!ELEMENT lang (#PCDATA)>
<!ATTLIST lang
type %language; #REQUIRED
>

<!-- HR: Container to hold any content that is encoded differently than the encoding specified in the config for that language -->
<!ELEMENT encoding (#PCDATA)>
<!ATTLIST encoding
type %encoding-types; #REQUIRED
>



<!--Line Controls-->
<!--The specific behavior intended for each must be defined-->
<!ELEMENT newline EMPTY>
<!ELEMENT separate EMPTY>
<!ATTLIST separate
type CDATA #IMPLIED
>
<!ELEMENT align EMPTY>
<!ATTLIST align
horiz %align-att; "left"
>
<!--EMPTY Reference Elements-->
<!ELEMENT bibr EMPTY>
<!ATTLIST bibr
rid IDREFS #REQUIRED
number CDATA #IMPLIED
>
<!ELEMENT pullquoter EMPTY>
<!ATTLIST pullquoter
rid IDREF #REQUIRED
>
<!--Reference Elements with Content-->
<!ELEMENT ancref (%plain-text;)*>
<!ATTLIST ancref
rid IDREF #REQUIRED
>
<!ELEMENT bibrinl (%plain-text;)*>
<!ATTLIST bibrinl
rid IDREFS #REQUIRED
>
<!ELEMENT bxr (%plain-text;)*>
<!ATTLIST bxr
rid IDREF #REQUIRED
>
<!ELEMENT coder (%text;)*>
<!ATTLIST coder
rid IDREF #REQUIRED
>
<!ELEMENT deflistr (%plain-text;)*>
<!ATTLIST deflistr
rid IDREF #REQUIRED
>
<!ELEMENT fdr (%plain-text;)*>
<!ATTLIST fdr
rid IDREFS #REQUIRED
>
<!ELEMENT figr (%plain-text;)*>
<!ATTLIST figr
rid IDREF #REQUIRED
>
<!ELEMENT fnr (%plain-text;)*>
<!ATTLIST fnr
rid IDREF #REQUIRED
>
<!ELEMENT fr (%plain-text;)*>
<!ATTLIST fr
rid IDREF #REQUIRED
>
<!ELEMENT annotation-ref (%plain-text;)*>
<!ATTLIST annotation-ref
rid IDREF #REQUIRED
title CDATA #IMPLIED
>
<!ELEMENT illusr EMPTY>
<!ATTLIST illusr
rid IDREF #REQUIRED
align %align-att; "right"
>
<!ELEMENT infographicr (%plain-text;)*>
<!ATTLIST infographicr
rid IDREF #REQUIRED
align %align-att; "right"
>
<!ELEMENT chemimgr EMPTY>
<!ATTLIST chemimgr
rid IDREF #REQUIRED
display-type CDATA #IMPLIED
align %align-att; "right"
>
<!ELEMENT illorinl (%plain-text;)*>
<!ATTLIST illorinl
rid IDREF #REQUIRED
align %align-att; "external"
>
<!ELEMENT imager EMPTY>
<!ATTLIST imager
rid IDREF #REQUIRED
align %align-att; "right"
>
<!ELEMENT mediar (%plain-text;)*>
<!ATTLIST mediar
rid IDREF #REQUIRED
>
<!ELEMENT ext-mediar (%plain-text;)*> 
<!ATTLIST ext-mediar 
rid IDREF #REQUIRED 
> 

<!ELEMENT tablr (%plain-text;)*>
<!ATTLIST tablr
rid IDREF #REQUIRED
>

<!ELEMENT slideshowr (%plain-text;)*>
<!ATTLIST slideshowr
rid IDREF #REQUIRED
align %align-att; "right"
>

<!-- HR: Compound Reference. REF attribute is CDATA, not IDREF, because required target ID is not inserted until build time -->
<!ELEMENT compoundr (%plain-text;)*>
<!ATTLIST compoundr
ref CDATA #IMPLIED
rid IDREF #REQUIRED
>

<!-- HR: Scheme Reference. -->
<!ELEMENT schemer (%plain-text;)*>
<!ATTLIST schemer
rid IDREF #REQUIRED
>

<!ELEMENT secr (%plain-text;)*>
<!ATTLIST secr
rid IDREF #REQUIRED
>

<!-- semantic text identifier for external applications -->
<!ELEMENT named-entity (%data;)*>
<!ATTLIST named-entity
id ID #REQUIRED
type (compound | geneprot) "compound"
entity CDATA #IMPLIED
>


<!--Link Elements-->
<!ELEMENT natlink EMPTY>
<!ATTLIST natlink
extrefid CDATA #REQUIRED
>
<!--Use instead of XREF for linking to any Nature Group article whenever full
 citational information (JTL, VID, PPF, PPL, CD) is available. NATLINK will be
 represented online with a special icon.-->
<!ELEMENT sir (%plain-text;)*>
<!ATTLIST sir
rid IDREF #REQUIRED
refobjid CDATA #IMPLIED
>
<!--Is 'refobjid' necessary? SIR, which is meaningful only for online rendering,
 references SUPPINFO, which in turn triggers a link to the article's Supp Info
 ToC. Since the 'extrefid' attribute of SUPPOBJ specifies its FICI number, no
 further reference from SIR seems necessary. The declaration has deliberately
 been left loose at present. If need be, SIR could be empty.-->

<!-- HR: Compound Index page reference -->
<!ELEMENT cir (%plain-text;)*>

<!ELEMENT url (#PCDATA | newline)*>
<!ELEMENT weblink (%plain-text; | newline | %emptyref;)*>
<!ATTLIST weblink
url CDATA #REQUIRED
type (errorcor | regular | special | max | box | overview | sidebar | infographic | audio | video | pdf | photo-album) #IMPLIED
id ID #IMPLIED
height CDATA #IMPLIED
width CDATA #IMPLIED
>
<!ELEMENT xnav (%plain-text;)*>
<!ATTLIST xnav
extrefid CDATA #REQUIRED
>
<!ELEMENT xref (%plain-text;)*>
<!ATTLIST xref
extrefid CDATA #REQUIRED
>
<!--For interjournal non-citational linking.-->
<!--ANCHOR and EMAIL (declared via %data;)-->
<!ELEMENT anchor EMPTY>
<!ATTLIST anchor
id ID #REQUIRED
>
<!--Specifies target for internal linking within a single article. May be
 inserted anywhere in any element with %data; or %text; content. ANCREF points
 to ANCHOR.-->
<!ELEMENT email (%data;)*>
<!ELEMENT corr EMPTY>
<!ATTLIST corr
filename CDATA #REQUIRED
>
<!ELEMENT company     (%plain-text;)*>
<!ATTLIST company    id ID #REQUIRED>		     

<!ELEMENT prod     (%plain-text;)*>
<!ATTLIST prod    id ID #REQUIRED
		  companyid IDREF #REQUIRED
		  name CDATA #IMPLIED>		  

<!ELEMENT brandname     (%plain-text;)*>
<!ATTLIST brandname    id ID #REQUIRED>

<!ELEMENT scientific     (%plain-text;)*>
<!ATTLIST scientific    id CDATA #IMPLIED
		        type (gene | protein) #REQUIRED
		        dbtype CDATA #IMPLIED>

<!ELEMENT keywordgrp (keyword+)>
<!ELEMENT keyword (%keyword;)*>
<!-- HR: Connotea attribute on KEYWORD should be used when connotea link tag can't be derived from keyword itself -->
<!ATTLIST keyword %glossid;
	  connotea CDATA #IMPLIED>

<!ELEMENT subject  (#PCDATA)>
<!ATTLIST subject
         code CDATA #IMPLIED
         priority (1 | 0) "0"
         id CDATA #IMPLIED
         type (npg.subject | npg.technique | npg.subjects | npg.techniques | npg_subjects | npg_techniques) "npg.subject"
         version CDATA #IMPLIED
         path CDATA #IMPLIED
>


<!ELEMENT technique  (#PCDATA)*>
<!ATTLIST technique
         code CDATA #IMPLIED
         priority (1 | 0) "0"
         id CDATA #IMPLIED
         type (npg.technique) "npg.technique"
         version CDATA #IMPLIED
         path CDATA #IMPLIED
>

<!ELEMENT article-grouping (title?)>
<!ATTLIST article-grouping
code CDATA #REQUIRED
type CDATA #REQUIRED
> 

<!ELEMENT indications (%plain-text;)*>
<!ATTLIST indications
code CDATA #REQUIRED
>
<!ELEMENT channel EMPTY>
<!ATTLIST channel
code CDATA #REQUIRED
>
<!-- Sub Classification areas currently being used for Nature papers-->
<!ELEMENT subclass      (%plain-text;)*>
<!ATTLIST subclass     code  CDATA #REQUIRED
		       id  CDATA #IMPLIED
		       role CDATA #IMPLIED
>

<!-- Career Stage classification for NJ articles -->
<!ELEMENT careerstage     EMPTY>
<!ATTLIST careerstage     code  CDATA #REQUIRED>

<!-- Discipline classification for NJ articles -->
<!ELEMENT discipline     EMPTY>
<!ATTLIST discipline     code  CDATA #REQUIRED>

<!ELEMENT sector      EMPTY>
<!ATTLIST sector      code CDATA #REQUIRED>

<!-- Region classification for NJ articles -->
<!ELEMENT region     (cont, co?, state?, area?)>

<!-- Continent region classification for NJ articles -->
<!ELEMENT cont     EMPTY>
<!ATTLIST cont     code  (asia | africa | na | sa | eur | aus | antarct | all) #REQUIRED>

<!-- State/Province region classification for NJ articles -->
<!ELEMENT state      EMPTY>
<!ATTLIST state code (AK | AL | AR | AZ | CA | CO | CT | DC | DE | FL | GA | HI | IA | ID | IL | IN | KS | KY | LA | MA | MD | ME | MI | MN | MO | MS | MT | NC | ND | NE | NH | NJ | NM | NV | NY | OH | OK | OR | PA | RI | SC | SD | TN | TX | UT | VA | VT | WA | WI | WV | WY | AB | BC | MB | NB | NF | NS | NT | NU | ON | PE | QC | SK | YT) #IMPLIED>

<!-- General area region classification for NJ articles - used for 'Worldwide' or any other info that does not qualify as continent or country -->
<!ELEMENT area      (#PCDATA)>

<!ELEMENT doi       (#PCDATA)>

<!-- HR: Alternative DOI -->
<!ELEMENT altdoi       (#PCDATA)>
<!ATTLIST altdoi     label  ID #REQUIRED>

<!-- HR: Manuscript tracking number if available -->
<!ELEMENT mtsno       (#PCDATA)>

<!-- PD: Optional element to track free-article licences -->
<!ELEMENT licence 	(weblink?, licence-text?, author-paid?, start-date?)>

<!ATTLIST licence 
		model (%apmodel;) "default"
		version CDATA #REQUIRED>

<!-- starting date of licence conditions -->
<!ELEMENT start-date    EMPTY>
<!ATTLIST start-date   %dateatt;>

<!ELEMENT author-paid 	EMPTY>
<!ATTLIST author-paid
      paid (yes | no) "yes" >

<!ELEMENT licence-text (%data;)*> 
