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Hi, as Tim seems to be still stuck in the snow, while we wait for version 8 of the document we could devote tonight's telecon on policy combination (which seems to have been the focus of the email exchanges last week). i enclose below a pointer at two works which we did here related to policy combination. The first one addresses policy combination, the second includes dealing with three values for deciding access (in a centralized context). best -p =========================================================== P. Bonatti, S. De Capitani di Vimercati, and P. Samarati, " "An Algebra for Composing Access Control Policies" in ACM Transactions on Information and System Security, to appear. http://seclab.dti.unimi.it/~samarati/Papers/tissec02.ps E. Damiani, S. De Capitani di Vimercati, S. Paraboschi, and P. Samarati "Fine-Grained access control for XML documents" by in ACM Transactions on Information and System Security, to appear. http://seclab.dti.unimi.it/~samarati/Papers/xml-tissec.ps