@JsonIgnore
    @Override
    public Set<String> getEntityAttributeValues() {
        return CollectionUtils.wrapSet("https://refeds.org/category/anonymous");
    }
Map of allowed attributes by this policy in the form of attribute name linked
to its equivalent urn value.
support/cas-server-support-saml-idp-core/src/main/java/org/apereo/cas/support/saml/services/AnonymousAccessAttributeReleasePolicy.java