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.
A file is
considered to be a XHTML document when the root element name is html.
The default schemas
used for these documents are stored in the following locations:
- XHTML 1.0 - [OXYGEN_DIR]/frameworks/xhtml/dtd/ or
[OXYGEN_DIR]/frameworks/xhtml/nvdl/.
- XHTML 1.1 - [OXYGEN_DIR]/frameworks/xhtml11/dtd/ or
[OXYGEN_DIR]/frameworks/xhtml11/schema/.
- XHTML 5 - [OXYGEN_DIR]/frameworks/xhtml/xhtml5 (epub3)/.
The CSS options for the XHTML document
type are set to merge the CSS stylesheets specified in the document with the CSS stylesheets
defined in the XHTML document type.
The default CSS files used for rendering XHTML
content in Author mode are stored in
[OXYGEN_DIR]/frameworks/xhtml/css/.
The default catalogs for
the XHTML document type are as follows:
- [OXYGEN_DIR]/frameworks/xhtml/dtd/xhtmlcatalog.xml
- [OXYGEN_DIR]/frameworks/relaxng/catalog.xml
- [OXYGEN_DIR]/frameworks/nvdl/catalog.xml
- [OXYGEN_DIR]/frameworks/xhtml11/dtd/xhtmlcatalog.xml
- [OXYGEN_DIR]/frameworks/xhtml11/schema/xhtmlcatalog.xml
- [OXYGEN_DIR]/xhtml5 (epub3)/catalog-compat.xml