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© 2006, 2007 Open Grid Forum Michel Drescher, FujitsuOGF-20, Manchester, UK Andreas Savva, FujitsuOGF-21, Seattle, US (update) Extending JSDL 1.0 with XQuery capabilities: Introduction
© 2006, 2007 Open Grid Forum 2 OGF IPR Policies Apply I acknowledge that participation in this meeting is subject to the OGF Intellectual Property Policy. Intellectual Property Notices Note Well: All statements related to the activities of the OGF and addressed to the OGF are subject to all provisions of Appendix B of GFD-C.1, which grants to the OGF and its participants certain licenses and rights in such statements. Such statements include verbal statements in OGF meetings, as well as written and electronic communications made at any time or place, which are addressed to: the OGF plenary session, any OGF working group or portion thereof, the OGF Board of Directors, the GFSG, or any member thereof on behalf of the OGF, the ADCOM, or any member thereof on behalf of the ADCOM, any OGF mailing list, including any group list, or any other list functioning under OGF auspices, the OGF Editor or the document authoring and review process Statements made outside of a OGF meeting, mailing list or other function, that are clearly not intended to be input to an OGF activity, group or function, are not subject to these provisions. Excerpt from Appendix B of GFD-C.1: Where the OGF knows of rights, or claimed rights, the OGF secretariat shall attempt to obtain from the claimant of such rights, a written assurance that upon approval by the GFSG of the relevant OGF document(s), any party will be able to obtain the right to implement, use and distribute the technology or works when implementing, using or distributing technology based upon the specific specification(s) under openly specified, reasonable, non- discriminatory terms. The working group or research group proposing the use of the technology with respect to which the proprietary rights are claimed may assist the OGF secretariat in this effort. The results of this procedure shall not affect advancement of document, except that the GFSG may defer approval where a delay may facilitate the obtaining of such assurances. The results will, however, be recorded by the OGF Secretariat, and made available. The GFSG may also direct that a summary of the results be included in any GFD published containing the specification. OGF Intellectual Property Policies are adapted from the IETF Intellectual Property Policies that support the Internet Standards Process.
© 2006, 2007 Open Grid Forum 3 Motivation JSDL 1.0 is self-sufficient Own information model Own requirements model JSDL 1.0 has well-known limitations Structure Need to make better distinction between Job Description and Job Requirements Resource requirements expressions are ok for simple cases but not flexible enough Ranges are interesting –What does 2.0 mean? Make leveraging emerging resource (a.k.a container) modeling work easier Separation of the Information Model
© 2006, 2007 Open Grid Forum 4 Proposed solution Two documents A job description A resource description Goals Does the job meet the resources requirements? Does the resource meet the jobs requirements?
© 2006, 2007 Open Grid Forum 5 Proposed extension Use external (resource) information model Currently in work in OGSA-WG Define new requirements extension Container for XQuery expressions In place of jsdl:Resources element Complementary check (Job capabilities) Left for JSDL 2.0
© 2006, 2007 Open Grid Forum 6 Structure comparison (pseudo) ? * * And ? Other (Application) extensions JobRequirements extension to encapsulate XQuery fragment ? Your XQuery here ? * And etc. Also Dependencies and … JSDL 1.xJSDL 2.x
© 2007 Open Grid Forum 7 Job Requirements specification use cases: List of requirements jsdl 1.0 jsdl 1.0 + extension for and only requirements or requirements: A or B preferences: For example, RedHat over any Linux weighting: optionality: We are not saying JSDL-WG will do all the above; just to place in context what the group will do
© 2007 Open Grid Forum 8 Job Requirements specification use cases: (re-ordered) Things to do (eventually) jsdl 1.0 (done) First draft is jsdl 1.0 + extension for and only requirements Baseline for the XQuery extension Functionally the same as jsdl:Resources or requirements: A or B Later version or further extension optionality: Not in scope of JSDL-WG preferences: For example, RedHat over any Linux weighting:
© 2007 Open Grid Forum 9 XQuery JSDL 1.0 + extension for and / or only requirements (notes) Define a new element jsdl:JobRequirements Specify if it appears it MUST appear in jsdl:JobDefinition at the same level as jsdl:JobDescription Specify that if it appears jsdl:Resources SHOULD not appear Is this just XPath 2.0? Maybe (probably a subset of) Also getting some additional operators, e.g, not Need a test case to determine whether XPath or XQuery Is yes/no sufficient or also selection So XQuery Need a resource information model GLUE 2.0 Specify how to allow or use other information models Things to be careful Namespaces Make it a target that it should be possible to translate to jsdl:Resources and also to Condor, RSL, etc? ACTIONS: Ask about existing work for mapping XQuery to RSL or … (Steve) Is this the right approach or should we be looking at other approaches? (Group- think; come back with some argument on next call) Is yes/no sufficient for practical resource mapping or is also selection needed? (Donal)
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