An important use case that SAML addresses is [[web browser|web-browser]] [[single sign-on]] (SSO). Single sign-on is relatively easy to accomplish within a [[Security ___domain|security ___domain]] (using [[HTTP cookie|cookies]], for example) but extending SSO across security domains is more difficult and resulted in the proliferation of non-interoperable proprietary technologies. The SAML Web Browser SSO profile was specified and standardized to promote interoperability.<ref name="SAMLProf20">J. Hughes et al. ''Profiles for the OASIS Security Assertion Markup Language (SAML) 2.0.'' OASIS Standard, March 2005. Document identifier: saml-profiles-2.0-os http://docs.oasis-open.org/security/saml/v2.0/saml-profiles-2.0-os.pdf (for the latest working draft of this specification with errata, see: https://www.oasis-open.org/committees/download.php/56782/sstc-saml-profiles-errata-2.0-wd-07.pdf)</ref>
