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This paper presents a first step towards a security model that defines access control for logical document structures. This model benefits from roles to abstract from users and from security levels (classifications) that abstract from objects. The security levels are defined on top of a complex document structure which will be needed for real web applications. Since a user clearance for an operation can be designated from roles and permissions, we use a lattice that defines a partial order overdoi:10.1109/dexa.1998.707420 dblp:conf/dexaw/DridiN98 fatcat:2okrnnzw3vfhbjh4kfjbp5qwuu