ReturnAttributes> element contains a list of attributes to be returned from the LDAP directory, to optimize the lookup.
Schema Name and Location
This element is defined by the
schema, which is located at http://shibboleth.net/schema/idp/shibboleth-attribute-resolver.xsd.
On OpenLDAP directory servers, operational attributes must be explicitly requested for them to be returned. If you'd like to return all attributes ( * ) from an OpenLDAP directory, and the operational attributes ( + ), use the following:
No attributes are defined.
No child elements are defined.