Taken from Wikipedia: Service Provisioning Markup Language (SPML) is an XML-based framework, being developed by OASIS, for exchanging user, resource and service provisioning information between cooperating organizations.

The Service Provisioning Markup language is the open standard for the integration and interoperation of service provisioning requests. SPML is an OASIS standard based on the concepts of Directory Service Markup Language. SPML version 1.0 was approved in October 2003. SPML version 2.0 was approved in April 2006. Security Assertion Markup Language exchanges the authorization data.