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XML (eXtensible Markup Language) is the ubiquitous low-level language of the World Wide Web, and forms the primary structure for the emerging Semantic Web. The Semantic Web is the vision, and ongoing implementation, of how the web will transform over time to connect disparate pieces of knowledge, data, and resources. Our purpose in this contract was to create a foundation for the Semantic Web, suitable for deployment within the Air Force Infosphere project. The concept behind the Infosphere is one of rapid data and knowledge interchange, between physical objects, models, and computational processes. In our work, we created two XML schemas, defining two applications: MXL and DXL. MXL (Multimodeling eXchange Language) defines dynamic system models at a fairly high level of abstraction, and DXL (Dynamics eXchange Language) defines a low-level, block-oriented, language for a wide variety of simulation applications. With initial results in 2001, these two languages represented the first thorough implementations of XML in simulation, and they led the way to subsequent, higher level ontology studies.