]> The schema corresponding to this document is normative, with respect to the syntactic constraints it expresses in the XML Schema language. The documentation (within <documentation> elements) below, is not normative, but rather highlights important aspects of the W3C Recommendation of which this is a part Get access to the xml: attribute groups for xml:lang First the builtin primitive datatypes. These definitions are for information only, the real builtin definitions are magic. Note in particular that there is no type named 'anySimpleType'. The primitives should really be derived from no type at all, and anySimpleType should be derived as a union of all the primitives. Now the derived primitive types pattern matches production 33 from the XML spec pattern matches production 7 from the XML spec pattern matches production 5 from the XML spec pattern matches production 4 from the Namespaces in XML spec This type is extended by almost all schema types to allow attributes from other namespaces to be added to user schemas. This type is extended by all types which allow annotation other than <schema> itself Can be restricted to required or forbidden Required at the top level Forbidden when nested base attribute and simpleType child are mutually exclusive, but one or other is required type attribute and simpleType child are mutually exclusive, but one or other is required types attribute must be non-empty or there must be at least one simpleType child each (8-bit) byte is encoded as a sequence of 2 hexidecimal digits value is encoded in Base64 as defined in the MIME RFC Not the real thing, provided just for completeness