whether the appendix is numbered (only needed if different from value of 'sectionsNumbered' on <body>) An appendix within a chapter or article. whether the sections, appendices, and protocols of this body are numbered (unless overridden on those elements) The narrative content of a document. the model version, which must be '2.0' 2.0 A root element (top-level structure) that is divided into a <header> and a <body>. An article-level list of abbreviations, acronyms, or terms and their definitions or expansions. the type of term to be used in this structure presentational hinting An automatically-generated glossary, list of abbreviations, acronyms, etc. Container for the non-narrative portions of a document (metadata, title, authors, abstract, etc.). responseToDoi the DOI of the letter this responds to in another article (if it exists) A letter to the editor or other article that constitutes a single piece of correspondence. Reproduction of a complete component (typically a journal article) within another, for commentary or historical reasons.