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2.2.11.7 Property Qualified Restriction

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If a property restriction is preceded by a minus character, the protocol server MUST evaluate it the same way as if it was preceded by the NOT operator. For example, -size=100 is equivalent to NOT size=100, which is in turn equivalent to size<>100.

If a property restriction is preceded by a plus character, the protocol server MUST ignore the plus character. For example, size=100 is equivalent to +size=100. 

 property-qualified-restriction = "+" property-restriction
 property-qualified-restriction =/ "-" property-restriction