The JDK built-in Catalog, introduced in JDK 22 with standard DTDs of the Java Platform, now includes the following DTDs and XSDs defined by W3C specifications. They will be loaded locally from the Catalog, without requiring network access.
- <a href="https://www.w3.org/XML/1998/namespace.html">The "xml:" Namespace</a>
- <a href="https://www.w3.org/TR/xmlschema-1/">XML Schema Part 1: Structures</a>
- <a href="https://www.w3.org/TR/xmlschema-2/">XML Schema Part 2: Datatypes</a>
- <a href="https://www.w3.org/TR/xhtml1/">XHTML™ 1.0 The Extensible HyperText Markup Language</a>
- <a href="https://www.w3.org/TR/xhtml11/">XHTML™ 1.1 Module-based XHTML</a>
- <a href="http://www.w3.org/2002/xmlspec/dtd/2.10/xmlspec.dtd">XML DTD for W3C specifications</a>