This glossary supports the following titles: SOA: Principles of Service Design (ISBN: 01323 44823, Prentice Hall) Service-Oriented Architecture: Concepts, Technology, and Design (ISBN: 0131858580, Prentice Hall) Service-Oriented Architecture: A Field Guide to Integrating XML & Web Services (ISBN: 0131 428985, Prentice Hall) For more information about this book series, visit: www.soabooks.com session data (state information type) Information used to represent or maintain a connection or correlation between message exchanges is referred to as session data. A common example of session data when services are implemented as Web services is the use of correlation identifiers in message headers. These values allow exchanges of messages between and across multiple services to remain synchronized and associated with the same overall service activity. The WS-Addressing MessageID element provides an industry-standard means of representing correlation identifiers within SOAP message headers. Session data represents one of three types of state information related to the application of the Service Statelessness design principle. The other two types are context and business information. See also: - Service Statelessness - active (primary state) - context (state information type) - context data (context data type) - context rules (context data type) - passive (primary state) - stateful (primary state condition) - stateless (primary state condition)

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