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

File Definition

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

Default Document Templates

There are a variety of default XHTML templates available when creating new documents from templates, including 1.0 Strict, 1.0 Transitional, 1.1 DTD Based, 1.1 Schema Based, and more.

The default templates for XHTML documents are located in the [OXYGEN_INSTALL_DIR]/frameworks/xhtml/templates/ folder.

Default Schema

Default schemas that are used if one is not detected in the XHTML file are stored in the following locations:
  • XHTML 1.0 - [OXYGEN_INSTALL_DIR]/frameworks/xhtml/dtd/ or [OXYGEN_INSTALL_DIR]/frameworks/xhtml/nvdl/.
  • XHTML 1.1 - [OXYGEN_INSTALL_DIR]/frameworks/xhtml11/dtd/ or [OXYGEN_INSTALL_DIR]/frameworks/xhtml11/schema/.
  • XHTML 5 - [OXYGEN_INSTALL_DIR]/frameworks/xhtml/xhtml5 (epub3)/.

Default CSS

The default CSS files used for rendering XHTML content in Author mode are stored in [OXYGEN_INSTALL_DIR]/frameworks/xhtml/css/.

By default, these default CSS files are merged with any that are specified in the document. For more information, see Selecting and Combining Multiple CSS Styles.

Default XML Catalogs

The default catalogs for the XHTML document type are as follows:
  • [OXYGEN_INSTALL_DIR]/frameworks/xhtml/dtd/xhtmlcatalog.xml
  • [OXYGEN_INSTALL_DIR]/frameworks/relaxng/catalog.xml
  • [OXYGEN_INSTALL_DIR]/frameworks/nvdl/catalog.xml
  • [OXYGEN_INSTALL_DIR]/frameworks/xhtml11/dtd/xhtmlcatalog.xml
  • [OXYGEN_INSTALL_DIR]/frameworks/xhtml11/schema/xhtmlcatalog.xml
  • [OXYGEN_INSTALL_DIR]/xhtml5 (epub3)/catalog-compat.xml

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