Advanced process manipulation

6.1 Introduction to Manipulating XML Data in BPEL Processes This section provides an introduction to using XML data in BPEL processes.6.1.1 XML Data in BPEL Processes In a BPEL process service component, most pieces of data are in XML format. This includes the messages passed to and from the BPEL process service component, the messages exchanged with external services, and the local variables used by the process. You define the types for these messages and variables with the XML schema, usually in one of the following: Web Services Description Language (WSDL) file for the flow WSDL files for the services it invokes XSD file referenced by those WSDL files Therefore, most variables in BPEL are XML data, and any BPEL process service component uses much of its code to manipulate these XML variables. This typically includes performing data transformation between representations required for different services, and local manipulation of data (for example, to combine the results from several service invocations). BPEL also supports service data object (SDO) variables, which are not in an XML format, but rather in a memory structure format. 6.1.2 Data Manipulation and XPath Standards in Assign Activities The starting point for data manipulation in BPEL is the assign activity, which builds on the XPath standard. XPath queries, expressions, and functions play a large part in this type of manipulation. In addition, more advanced methods are available that involve using XQuery, XSLT, or Java, usually to do more complex data transformation or manipulation. This section provides a general overview of how to manipulate XML data in BPEL. It summarizes the key building blocks used in various combinations and provides examples. The remaining sections in this chapter discuss and illustrate how to apply these building blocks to perform specific tasks. You use the assign activity to copy data from one XML variable to another, or to calculate the value of an expression and store it in a variable. A copy element within the activity specifies the source and target of the assignment (what to copy from and to), which must be of compatible types. The following example shows the formal syntax for BPEL version 1.1, as described in the Business Process Execution Language for Web Services Specification: standard-elements from-spec to-spec The next example shows the formal syntax for BPEL version 2.0, as described in the Web Services Business Process Execution Language Specification Version 2.0. The keepSrcElementName attribute specifies

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