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Can you tell me why decidability was given that level of importance? This is what I meant by "over-engineered" when I could have said "over-specified". There is a paper from TimBL on the issue of FOL and the SemWeb at http://www.w3.org/DesignIssues/Logic which I have trouble following not being well-trained or just not able to determine his conclusions. Dan Connoly comments on it elsewhere. At first, I thought it the case that the notion was to not require FOL so that other logic systems could be used as needed, or as in the spirit of HTML, to make initial fielding easy and get some mind share. Your arguments make me unsure because requiring decidability would seemingly make it harder and cut the SemWeb away from uptake of where the majority of the world's business semantics reside: relational databases with client or server based business rules and logic in the form of code libraries. This would appear to limit the role of the semweb to being merely metadata about web pages, and that isn't that useful. So that can't be right. len From: Miles Sabin [mailto:miles@m...] And this is where the constraint that Len was complaining about bites: the base-level logical frameworks being considered for the SW insist on decidability, and that excludes many practically useful, tho' formally undecidable first-order theories.
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