This documentum tests based on
XML Schema Part 0: Primer Second Edition,
2.3 Simple Types and
Appendix B
XML Schema Part 2: Datatypes Second Edition
3 Built-in Datatypes
For WhiteSpace see
XML Schema Part 2: Datatypes Second Edition 4.3.6
i.e http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/datatypes.html#rf-whiteSpace
and
ETSI ES 201 873-9 V4.1.2 / Ch 6.1.5