This is an attempt to codify the authentication and authorization information that is passed internally within astrogrid. This information comes under the community banner, but be aware that community also is the name for a specifc piece of this information. Be ware that this schema does not yet attempt to define items directly in terms of standard ivoa schema This is a placeholder for restrictions that might be on the securitytoken. This is simply a placeholder for any restrictions that we might want to make on the string type for account and community identifiers. The identifier base class. Contains the name and the community The full authorization and authentication credentials. A security group used in authorization. The user account. The security token used in authentication.