All About XHTML 1.1 Modules
The XHTML 1.1 DTD is a driver DTD that includes DTD modules. A DTD module is a section of a DTD that has two parts: an abstract part, which specifies what the DTD does in human-readable language, and the module itself, which is a DTD fragment that contains element types, a set of attribute list declarations, and a set of content model declarations.
You can find the XHTML 1.1 driver DTD at www.w3.org/TR/xhtml11/xhtml11_dtd.html#a_xhtml11_driver and the actual implementation of the XHTML 1.1 modules (there's one for forms, one for text, one for images, and so on) at www.w3.org/TR/xhtml-modularization/dtd_module_defs.html#a_xhtml11_modules. You'll find the XHTML 1.1 modules listed in Table 17-1.
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