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The ScopeMatchesShibMDScope type is a Matcher which filters results based on <shibmd:Scope> elements contained in the <md:Extensions> element of the issuer's <md:EntityDescriptor> or <md:RoleDescriptor> . The resulting set of attribute values will only contain:
Scoped Attribute values (that is, of type ScopedStringAttributeValue)
Values whose scope matches one of the values specified in a
<shibmd:Scope>element within the issuer's<md:EntityDescriptor>or appropriate<md:RoleDescriptor>.
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