2.1.4.3.4 Sel-condition
This processing step MUST fill one InternalMatchingClaimsList with zero or more claims from the InternalEvaluationContext. If an IDENTIFIER is used in the Sel-condition, the InternalMatchingClaimsList MUST be tagged by the string represented by the IDENTIFIER.
InternalMatchingClaimsList is filled by evaluating Opt-cond-list.
If the InternalMatchingClaimsList contains zero claims, the returned evaluation result MUST be FALSE; else it MUST be TRUE.