Security Assertion Markup Language
SAML is a dialect of eXtensible Markup Language (XML). Its main purpose is to provide a method so that a user can log on once for (associated but separate) Web sites and possibly other 'services'. SAML is part of the underpinning ideas of [http://shibboleth.internet2.edu/ Shibboleth] and now part of the [http://www.oasis-open.org/ OASIS] standards.
For more information, see [http://www.opensaml.org/ OpenSAML].