Overview Document URL   An address of an Hypertext Transfer Protocol (HTTP)-accessible resource that hosts data or information you would like to associate with an entity. For example, a tModel overview document might provide the URL to an interface definition or Web Service Description Language (WSDL) file that provides technical information that is required to invoke a service through an interface. For an instance info, an overview document might provide additional technical information that is only applicable to a specific implementation of an interface.