regarding E1-6: Whitespace and identity constraint XPath expressions

Hello

as of http://www.w3.org/2001/05/xmlschema-errata#E1-6 whitespace can be
used in XPath expressions 
when defining identity constraints. 
However, the schema for schemas gives pattern facets for the xpath
attribute. These regular expressions 
do not reflect the additional degree of freedom.

Best regards
Uli