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Since the Web is becoming the main means of disseminating information in private and public organizations, both at internal and external levels, several applications at Internet and intranet level need mechanisms supporting a selective access to data available over the Web. Through XML, the document exchange and acquisition processes, which can be very frequent in Web-based systems, are simplified and standardized. The development of suitable security policies for both access control anddoi:10.4018/9781591400356.ch011 fatcat:kjx2urm23vbfze2ntpym2x3cri