August 2005
Intermediate to advanced
350 pages
10h 29m
English
Content preview from Essential Business Process ModelingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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IBM WSFL: BPEL Forerunner
IBM published Web Services Flow Language[*] in 2001 with the familiar purpose of standardizing the
design of web-service-oriented business processes spanning multiple
participants. WSFL has so much in common with BPML, WSCI, XLANG, BPEL,
and other XML-based process languages that given also its complete
lack of industry support, it is tempting to discount it entirely.
Indeed, even IBM has given up on it, but only because IBM decided to
join forces with Microsoft and BEA on BPEL. As it turns out, IBM’s
involvement in the design of BPEL resulted in core WSFL ideas (e.g.,
flow, dead path elimination)
infiltrating BPEL. WSFL’s influence on BPEL makes it worthy of
investigation.
WSFL supports the definition of two types of process models:
- Flow model
The orchestration of web service operations for a single participant.
- Global model
The exchange, or choreography, of messages by web service invocation across a set of participants.
The ubiquitous purchasing example (used in countless BPM
discussions) demonstrates a WSFL implementation of both models. Figure 9-9 shows the exchange
of messages between three participants: Consumer, Retailer, and Warehouse. Each participant has its own flow
model, shown as the arrangement of circles (representing
activities) and solid arrows (control
links) running from top to bottom starting immediately
below the participant name. The dotted arrows, which connect
activities across different flows, are called plug
links ; the global model ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.