The XHTML Document Type

The Extensible HyperText Markup Language, or XHTML, is a markup language that has the same depth of expression as HTML, but also conforms to XML syntax.

A file is considered to be a XHTML document when the root element name is a html.

The schema used for these documents is located in ${frameworks}/xhtml/dtd/xhtml1-strict.dtd, where ${frameworks} is a subdirectory of the Oxygen XML Editor plugin install directory.

The default CSS options for the XHTML document type are set to merge the CSSs specified in the document with the CSSs defined in the XHTML document type.

The CSS file used for rendering XHTML content is located in ${frameworks}/xhtml/css/xhtml.css.

There are three default catalogs for XHTML document type: