As defined in the REFEDS eduPerson schema and the SAML v2.0 Subject Identifier Profile, an IdP's permissible scopes are expressed in the <md:Extensions> element of the IdP's metadata:
<md:Extensions xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata">
<shibmd:Scope regexp="false"
xmlns:shibmd="urn:mace:shibboleth:metadata:1.0">internet2.edu</shibmd:Scope>
</md:Extensions>
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See Scope for information about how the Scope element is used in InCommon metadata.