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I am becoming interested in sheaves valued over sets with order; poset valued sheaves and frame (or locale) valued sheaves in particular. Is there much work on the properties of categories of these sheaves ? Can I expect any kind of logic in these categories, or does the logical structure only appear in the set valued case ? I'm sorry this question is a little vague, but if I knew the question I really wanted to ask, I'd understand my problem much better ... Thanks. David Murphy dvjm%uk.ac.glasgow.cs@nsfnet-relay dvjm%uk.ac.glasgow.cs@ukc.uucp dvjm%uk.ac.glasgow.cs@UKACRL