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2.2.11.4 Property Constraint

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The protocol server MUST support two ways of specifying property constraint. The first is property restriction - qualified or not qualified. In this case, the constraint MUST match the item if the restriction matches the item. The second way is the property expression enclosed in parenthesis. In this case, the constraint MUST match the item if the enclosed expression matches the item.

 property-constraint = property-qualified-restriction / property-restriction
 property-constraint =/ "(" *ws property-expression *ws ")"