BPML-BPEL4WS.pdf

BPML | BPEL4WS

A Convergence Path toward a Standard BPM Stack

Position Paper

August 15, 2002

The release by BEA, IBM, and Microsoft of BPEL4WS, a new language for the modeling

of executable business processes, adds another candidate speciication to the emerging

standard BPM stack. The future directions announced for BPEL4WS follow the footsteps

of BPML identifying possible paths of convergence for the BPM industry.

Prior to this release, the emerging BPM industry has been

considering multiple alternative paths for the modeling

of executable business processes. Microsoft pioneered

the adoption of the Pi-Calculus model with XLANG, IBM

rejuvenated the use of Petri Nets with WSFL, and BPMI.org

uniied the two approaches with BPML 1.0. Alongside such

parallel efforts, other organizations advocated radically

different approaches for business process modeling, such

as ebXML BPSS developed by OASIS.

With the release of BPEL4WS, BEA, IBM, and Microsoft have

adopted a model that is signiicantly similar to the one

promoted by BPMI.org with BPML 1.0, therefore opening

the door to a convergence of standards in the BPM industry

around a common model shared by leading organizations.

BPMI.org welcomes this new release with great enthusiasm

and is working on identifying possible paths of convergence

that will offer customers a uniied stack for BPM.

Now that the BPM industry has started to consolidate

on a common vision for Business Process Management,

BPMI.org’s original mission is more critical than ever.

The Initiative’s mission is to promote and develop the

use of Business Process Management (BPM) through the

establishment of standards for process design, deployment,

execution, control, and optimization. In that respect,

BPMI.org is not only interested in the execution side of

business processes—currently covered by speciications

such as BPML and BPEL4WS—but also their design

by business analysts through the development of the

Business Process Modeling Notation (BPMN), as well as

their deployment, control, and optimization, through the

development of the Business Process Query Language

(BPQL). With such developments, BPMI.org remains the irst

and only independent organization fully dedicated to the

development of a royalty-free BPM stack.

BPML and BPEL4WS share similar roots in Web Services

(SOAP, WSDL, UDDI), take advantage of the same XML

technologies (XPath, XSDL), and are designed to leverage

other speciications (WS-Security, WS-Transactions). Beyond

these areas of commonality, BPML supports the modeling

of real-world business processes through its unique

support for advanced semantics such as nested processes

and complex compensated transactions, capabilities

BPEL4WS has yet to address. The authors of the BPEL4WS

speciication acknowledge such limitations in Section

13 of their recent draft, thus identifying a clear path of

convergence toward a model similar to BPML’s.

BPMI.org acknowledged early on the possiblity that

multiple standards might coexist before any real

consolidation takes place in the industry. This fact strongly

motivated BPMI.org’s participation in the development

of the Web Service Choreography Interface (WSCI), which

was approved as a note by the W3C on August 8, 2002*.

WSCI, best described as a process interface deinition

language for business processes, is the largest common

denominator to BPML and BPEL4WS. By offering “out-of-

the-box” interoperability across these two languages as

well as ebXML BPSS and WfMC’s XPDL, WSCI has greatly

contributed to the consolidation of a standard BPM stack.

Some Facts about BPML & BPEL4WS

n BPML and related speciications within BPMI.org’s standard BPM stack are provided as royalty free.

n BPML is a strict superset of BPEL4WS.

n BPML and BPEL4WS share an identical set of idioms and similar syntaxes as the basis for convergence.

n BPML provides a rich and mature language for expressing both simple as well as inherently complex business processes.

n BPML and BPEL4WS are both block-structured languages, with the addition of nested processes in BPML.

n BPML is based on a logical process model that can fully express concurrent, repeating, and dynamic tasks.

n BPML builds on the foundation of WSCI for expressing public interfaces and choreographies.

* WSCI was submitted to the World Wide Web Consortium (W3C) by BEA Systems, BPMI.org, Commerce One, Fujitsu Limited, Intalio, IONA,

Oracle Corporation, SAP AG, SeeBeyond Technology Corporation and Sun Microsystems.

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: