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Our XACL authoring environment consists of a policy editor and a visual test tool. The policy editor, a customized XML editor, provides advanced support for writing XACL rules. The visual test tool enables the policy author to query a policy. Queries can easily be composed and passed on as access requests to the XACL Processor. The processor's decisions are then visualized on a tree view of the underlying XML document, using for example icons to symbolize different access privileges and color coded node labels for access decisions.