Additional Constructs in the BPEL Process

The next sections outline the following, additional constructs:

• compensation handlers

• correlation sets

• event handlers

• fault handlers

• imports

• message exchanges

• partner links

• process

• termination handlers

• variables

Compensation Handlers

A compensation handler is an activity (usually a structured activity) that

• compensates for a change made successfully by the scope

• runs after being invoked by a parent scope

We describe compensation in Chapter 7.

 <compensationHandler>    activity </compensationHandler> 

Here's an example.

 <compensationHandler name="RemoveQuote">    <sequence>       <invoke name="RemoveQuote"               partnerLink="QuoteManagementPL"               portType="QuoteManagementPT"               operation="releaseQuote"               inputVariable="quoteDetail" />    </sequence> </compensationHandler> 

Correlation Sets

A correlation set is a list of properties whose values are expected to remain constant throughout a process or throughout a specific scope. We describe correlation sets and their purpose in Chapter 7.

 <correlationSets>?    <correlationSet name="NCName" properties="QName-list" />+ </correlationSets> 

Here's an example.

 <correlationSets>    <correlationSet name="Order"                    properties="customerID orderID" /> </correlationSets>