John Cowan has posted on xml-dev a generic Relax NG schema for Xlink, taking advantage of the flexibility of Relax NG wildcard patterns to validate any document only if it conforms to XLink.

Generic schemas validating XLink attributes in any XML document need to define wildcards for the name and content of such elements while still expressing the constraints between elements holding these attributes (such as: extended XLinks include resources, locators, and arcs). This is impossible for DTDs or W3C XML Schema, the reason why no normative schema for XLink has ever been published.

Other stories:

• XLink XLink, XML Base reach Recommendation
• RELAX NG becomes ISO draft standard
• A RELAX NG schema for W3C XML Schema