This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
The pattern facet expression must be provided for the selectorXPathType and fieldXPathType type definitions in the SML schema. (Let's not lose sight of the fact that this still has to complete the SML schema.)
The schema WG actually gave up on this. See appendix A of the schema 1.1 working draft [1]. It's sufficient to say something like "the value MUST conformed to the XPath subset defined ..." [1] http://www.w3.org/TR/xmlschema11-1/
As per the decision on 10/25 call
added the following comments at appripriate location in the sml-source.xsd: <!-- The value MUST conform to the selector BNF grammar defined in section '4.4 Identity Constraints' in the SML specification. --> <!-- The value MUST conform to the field BNF grammar defined in section '4.4 Identity Constraints' in the SML specification. -->