XML Datatypes

XmlTime	Concrete xs:time builtin type.
XmlDate	Concrete xs:date builtin type.
XmlDateTime	Concrete xs:dateTime builtin type.
XmlDuration	Concrete xs:duration builtin type.
XmlPeriod	Concrete xs:gYear/Month/Day builtin type.
XmlHexBinary	Subclass bytes to infer base16 format.
XmlBase64Binary	Subclass bytes to infer base64 format.