More and more information is distributed in XML format, both on corporate I
ntranets and on the global Net. In this paper an Access Control System for
XML is described allowing for definition and enforcement of access restrict
ions directly on the structure and content of XML documents, thus providing
a simple and effective way for users to protect information at the same gr
anularity level provided by the language itself. (C) 2000 Published by Else
vier Science B.V. All rights reserved.