The document contains several XRDS (Extensible Resource Descriptor) documents. The first XRDS document describes an OpenID provider and the services it supports for single sign-on. The second XRDS document describes how to discover resource descriptors for the domain gmail.com. The third XRDS document is a resource descriptor that describes information about the account acct:walkah@gmail.com, including aliases, links to profile and contact information.