]> 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. See below (at the bottom of this document) for information about the revision and namespace-versioning policy governing this schema document. A utility type, not for public use #all or (possibly empty) subset of {restriction, extension, union, list} A utility type, not for public use Can be restricted to required or forbidden Required at the top level Forbidden when nested An abstract element, representing facets in general. The facets defined by this spec are substitutable for this element, and implementation-defined facets should also name this as a substitution-group head. base attribute and simpleType child are mutually exclusive, but one or other is required itemType attribute and simpleType child are mutually exclusive, but one or other is required memberTypes attribute must be non-empty or there must be at least one simpleType child In keeping with the XML Schema WG's standard versioning policy, this schema document will persist at the URI http://www.w3.org/2012/04/datatypes.xsd. At the date of issue it can also be found at the URI http://www.w3.org/2009/XMLSchema/datatypes.xsd. The schema document at that URI may however change in the future, in order to remain compatible with the latest version of XSD and its namespace. In other words, if XSD or the XML Schema namespace change, the version of this document at http://www.w3.org/2009/XMLSchema/datatypes.xsd will change accordingly; the version at http://www.w3.org/2012/04/datatypes.xsd will not change. Previous dated (and unchanging) versions of this schema document include: http://www.w3.org/2012/01/datatypes.xsd (XSD 1.1 Proposed Recommendation) http://www.w3.org/2011/07/datatypes.xsd (XSD 1.1 Candidate Recommendation) http://www.w3.org/2009/04/datatypes.xsd (XSD 1.1 Candidate Recommendation) http://www.w3.org/2004/10/datatypes.xsd (XSD 1.0 Recommendation, Second Edition) http://www.w3.org/2001/05/datatypes.xsd (XSD 1.0 Recommendation, First Edition)