See the SAML 2.0 profiles documentation at http://docs.oasis-open.org/security/saml/v2.0/saml-profiles-2.0-os.pdf section 4.3.
This is needed to claim SAML 2.0 conformance.
This issue ticket was originally removed from the tracker as it clashed with the pull request. See upstream ticket for migration details.
Metadata Update from @t0xic0der: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)