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.
Default schemas that
are used if one is not detected in the XHTML file 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 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