<xs:group name="facets" >
  <xs:annotation>
    <xs:documentation>
       We should use a substitution group for facets, but
       that's ruled out because it would allow users to
       add their own, which we're not ready for yet.
    </xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:element ref="xs:minExclusive"/>
    <xs:element ref="xs:minInclusive"/>
    <xs:element ref="xs:maxExclusive"/>
    <xs:element ref="xs:maxInclusive"/>
    <xs:element ref="xs:totalDigits"/>
    <xs:element ref="xs:fractionDigits"/>
    <xs:element ref="xs:length"/>
    <xs:element ref="xs:minLength"/>
    <xs:element ref="xs:maxLength"/>
    <xs:element ref="xs:enumeration"/>
    <xs:element ref="xs:whiteSpace"/>
    <xs:element ref="xs:pattern"/>
  </xs:choice>
</xs:group>