# Document
A copy of the Document class from `libxmljs` with extra methods and existing ones modified.
## Constructor
### new Document(source = null, type = Document.TYPE_XML, options = null);
>Creates a new `Document`.
>**args**
*source*: `string` (optional) - The source as a string.
*type*: `number` (optional) - The type of the `Document`.
*options*: `libxmls.ParserOptions` (optional) - The parser options.
## Properties
### static TYPE_XML: `number`
>Describe the `Document` as an XML document.
>**value**
0
### static TYPE_HTML: `number`
>Describe the `Document` as an HTML document.
>**value**
1
### static TYPE_HTML_FRAGMENT: `number`
>Describe the `Document` as an HTML fragment.
>**value**
2
### _original: `libxmljs.Document|null`
>The internal `libxmljs.Document` instance.
### _hasContent: `boolean`
>Tells whether the `Document` has content.
### namespace: `object|null`
>The object that holds the namespace information.
### errors: `SyntaxError[]`
>An array containing the errors in the current `Document`.
### validationErrors: `ValidationError[]|undefined`
>An array containing the validation errors in the current `Document`.
## Methods
### child(idx): `libxmljs.Element|null`
>Gets the idxth child of the root node.
>**args**
*idx*: `number` - The child index.
>**returns** A `libxmljs.Element` or `null`.
### childNodes(): `libxmljs.Element[]`
>Gets all the children of the root node.
>**returns** An array of `libxmljs.Element`s.
### count(xpath): `number`
>Counts the amount of results of the provided XPath.
>**args**
*xpath*: `string` - The XPath to count.
>**returns** The amount of results.
### encoding(): `string`
>Gets the `Document`'s encoding.
>**returns** The `Document`'s encoding.
### encoding(enc): `Document`
>Sets the `Document`'s encoding.
>***args**
*enc*: `string` - The encoding as a string.
>**returns** The `Document`.
### find(xpath): `libxmljs.Element[]`
>Finds the result of the provided XPath.
>**args**
*xpath*: `string` - The XPath to find.
>**returns** An array of `libxmljs.Element`s.
### fromHtml(html, options = {}): `Document`
>Parses an HTML document.
>**args**
*html*: `string` - The HTML content.
*options*: `libxmljs.ParserOptions` (optional) - The parser options.
>**returns** The `Document`.
### fromHtmlFragment(htmlFragment, options = {}): `Document`
>Parses an HTML fragment.
>**args**
*htmlFragment*: `string` - The HTML content.
*options*: `libxmljs.ParserOptions` (optional) - The parser options.
>**returns** The `Document`.
### fromXml(xml, options = {}): `Document`
>Parses an XML document.
>**args**
*xml*: `string` - The XML content.
*options*: `libxmljs.ParserOptions` (optional) - The parser options.
>**returns** The `Document`.
### get(xpath): `libxmljs.Element`
>Gets the first result of the provided XPath.
>**args**
*xpath*: `string` - The XPath to get.
>**returns** A `libxmljs.Element`.
### getDtd(): `object`
>Gets the `Document`'s DTD.
>**returns** The DTD object.
### namespaces(): `libxmljs.Namespace[]`
>Gets the `Document`'s namespaces.
>**returns** An array of `libxmljs.Namespace`s.
### node(name, content): `libxmljs.Node`
>Creates the root.
>**args**
*name*: `string` - The root's tag name.
*content*: `string` - The root's text content.
>**returns** The created `libxmljs.Node`.
### rngValidate(rng): `boolean`
>Checks whether the `Document` is valid using Relax NG.
>**args**
*rng*: `object` - The Relax NG.
>**returns** Whether the `Document` is valid using Relax NG.
### root(): `libxmljs.Element|null`
>Gets the root.
>**returns** The root or `null`.
### root(node): `libxmljs.Element`
>Sets the root.
>**args**
*node*: `libxmljs.Element` - The root `libxmljs.Element`.
>**returns** The created `libxmljs.Element`.
### setDtd(name, ext, sys): `Document`
>Sets the `Document`'s DTD.
>**args**
*name*: `string` - The name of the DTD.
*ext*: `string` - The external ID for the DTD.
*sys*: `string` - The system ID for the DTD.
>**returns** The `Document`.
### setNamespace(alias, url): `Document`
>Sets the `Document`'s namespace.
>**args**
*alias*: `string` - The alias of the namespace.
*url*: `string` - The URL of the namespace.
>**returns** The `Document`.
### toString(formatting = true): `string`
>Returns the `Document` as a string.
>**args**
*formatting*: `boolean` (optional) - Tells whether the ouput is formatted.
>**returns** The `Document` as a string.
### type(): `string`
>Returns the string "document".
>**returns** "document".
### validate(xsdDoc): `boolean`
>Validates the `Document` against a XSD document.
>**args**
*xsdDoc*: `Document` - The XSD `Document`.
>**returns** Whether the `Document` is valid. `validationErrors` contains the errors if any.
### version(): `string`
>Gets the `Document`'s version.
>**returns** The `Document`'s version.
### assertNoContentError(): `void`
>Throws an error if the `Document` has no content.
