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The Production Grid Interoperability Working Group identified a number of execution management use cases and requirements in GFD.180. A number of ways to meet these requirements have been extensively discussed. They fall into two categories: 1) define a new set of specifications from scratch to meet the requirements, and 2), profile and minimally extend existing specifications to meet the requirements.

The second approach, combining and refining existing production use specifications, has been embraced by the existing OGSA BES and JSDL communities. The approach combines, extends, and profiles five existing specifications to meet the PGI requirements: WS Addressing EndPoint References, OGSA Basic Execution Services (OGSA_BES, or BES) [GFD.108], RNS 1.1 OGSA-WSRF Basic Profile 1.0 [GFD.172], WS-Iterator 1.0 [GFD.188], and OGSA-ByteIO WSRF Basic Profile 1.0 [GFD.98].

The BES/JSDL extensions described in this document are a part of the second approach. Along with the BES Basic Directory Profile (BDP) and the Activity Endpoint Profile (AEP) the BES/JSDL extensions meet the PGI requirements. Profiled JSDL extensions and their corresponding additions to BES factory attributes include: incorporation of GLUE2 [] compute resource properties, arbitrary name/value pair matching parameters, additional file system types, and richer file staging options. The profiled BES extensions include a substate model with a set of “Held” substates and pre-and-post-processing substates, a “ResumeActivities” porttype, and clarified JSDL mechanism to subscribe to notifications.