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Subject: dipal and WS-Agreement
Colleagues, To restart the discussion for this new year, I would like to suggest that DIPAL would be an ideal assertion/condition expression language for use with the WS-Agreement specification being developed in the Global Grid Forum Grid Resource Allocation and Agreement Protocol WG (http://www.ggf.org/Public_Comment_Docs/Documents/Oct-2005/WS-AgreementSpecificationDraft050920.pdf). The WS-Agreement specification specifically says that WS-Agreement will use condition expression languages defined by other standards groups. They mention XQuery as an example of such a language, but XQuery has the disadvantage of not having a well-defined condition intersection function: if two agreements contain conditions over the same variable/schema element expressed using XQuery, it is not possible to determine automatically whether the two conditions are compatible or what their intersection is (i.e. what XQuery expression would satisfy both agreement conditions). The condition functions defined in WS-PolicyConstraints, however, have completely defined, efficient intersection algorithms. Opinions? Other ideas about how DIPAL might fit into other proposed standards? Regards, Anne -- Anne H. Anderson Anne.Anderson@sun.com Sun Microsystems Labs 1-781-442-0928 Burlington, MA USA
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