protected List<String> determineRequestedAttributeDefinitions(final RegisteredServiceAttributeReleasePolicyContext context) {
        return new ArrayList<>();
    }
This method should be overridden by release policies that are able to request definitions by listing them as being
released in the policy.  This method should return the list of definitions keys that need to be resolved by the
definition store so the can be resolved and released to the client.

@param context the context
@return - List of requested attribute definitions to be released.
core/cas-server-core-authentication-attributes/src/main/java/org/apereo/cas/services/AbstractRegisteredServiceAttributeReleasePolicy.java