BPEL (Business Process Execution Language)
BPEL is an orchestration language to compose multiple Web Services
together into another Web Service. BPEL adopts Web Services as its
external communication mechanism. Thus BPEL's messaging facilities
depend on the use of the Web Services Description Language (WSDL)
1.1 to describe outgoing and incoming messages.
In addition to providing facilities to enable sending and receiving
messages, the BPEL programming language also supports:
- A property-based message correlation mechanism
- XML and WSDL typed variables
- An extensible language plug-in model to allow writing expressions
and queries in multiple languages: BPEL supports Xpath 1.0 by default
- Structured-Programming constructs including if-then-elseif-else,
while, sequence (to enable executing commands in order) and flow
(to enable executing commands in parallel)
- A scoping system to allow the encapsulation logic with local
variables, fault handlers, compensation handlers and event handlers
- Serialized scopes to control concurrent access to variables
The official BPEL
wiki site contains many useful links and references.
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