These appendixes contain supplementary information that I felt was important but didn't quite fit as chapters of the book, so I have included them in this final section for your reference. Appendix A is designed to get you up to speed quickly with OmniMark, which plays a key role in the BFC server in Chapter 11. Appendix B, which contains the BizTalk Framework specification, and Appendix D, which contains the SOAP 1.1 specification, will be especially useful as you work your way through the code examples in Chapters 8 and 11. Appendix C lists a number of Web sites related to XML and BizTalk that I visit frequently.