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In the latest version of the S4SD, elements such as xs:pattern are described as members of the substitution group of xs:facet. However, the schema has blockDefault="#all", and the declaration of xs:facet does not override this, so substitution is blocked.
Making this dependent on bug 6120 "Reconsider blockDefault=#all". If "blockDefault" is removed, then this issue is automatically fixed.
See bug 6120. On 2008-10-10, the working group decided to remove blockDefault=#all from the schema for schema documents.