A system and method for representing MFS control blocks in XML for MFS-based IMS applications utilizes an MFS XML adapter and an MFS XML repository to translate between XML and MFS. The repository contains XML files for DOF/MOD and XML files for DIF/MID. When an XML request is received, the XML request is transformed to a byte stream by retrieving the relevant information from the MFS XML repository. The byte stream can then be placed in an IMS message queue to await processing by an MFS-based IMS application program. A byte stream response is generated by the MFS-based IMS application and is transformed into an XML response, again, by retrieving the relevant information from the MFS XML repository.