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Grid systems involve the coordination of resources and services that are not subject to centralized control, span multiple trust domains and are accessible by a large number of users. They require a functionality for mapping users and credentials that exist at the virtual level to users and credentials that exist at the physical level. In this paper, we present a rigorous modeling of the Virtual Organization Membership Service (VOMS), a credential-based access control system. It enables thedoi:10.15161/oar.it/1448986128.81 fatcat:oi7viyf7vfg3niczuh6t5r4vh4