This part explains the conceptual framework for XML schemas and defines the abstract data model. The second part defines data types. XML Schema has reached Proposed Recommendation status. The XML Query Working Group has produced a working draft of the XML Query Algebra. With a formal algebra, it is possible to build query optimizers and perform type checking.
Web services is an important new model for doing distributed processing on the Web.
Collaborative processing among trading partners with web services requires distributed transaction processing. XAML is a specification for distributed transaction processing by web services. It uses XML message interfaces and defines protocols that can operate over the existing web infrastructure. This document presents the conceptual architecture of BizTalk 2.0. The RDF Schema Specification became a Candidate Recommendation in March 2000.