1. A light weight data model for processing a markup language security message, the light weight data model comprising: one or more processors, one or more computer readable memories, and one or more computer readable storage devices; and program instructions stored on at least one computer readable storage device for execution by at least one processor via at least one computer readable memory for mapping portions of a markup language security message that is used for decrypting and accessing data in the markup language security message to a transformation sequence, and for excluding from mapping to the transformation sequence other portions of the markup language security message that are not used for processing the markup language security message.