'Helper' Specifications
- XML Namespaces: Mix-and-match
- XSLT: Transformations from XML to XML
- XLink
- XPointer: XML fragment identifiers
- XBase
- XML Schema: DTD replacement in XML and more datatypes
- Stylesheets: CSS, XSL
- DOM: API access to XML documents
- XML Protocol, XML Query
- XML Signature, Encription
- XML Information Set: Abstract description of XML document
