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- W2067710112 abstract "Modelling problems include insufficient formalism of semantics, ambiguities in domain definition and inadequate representation of facts and constraints. Widely-followed principles of sequential processes are no longer acceptable because of unrealistic restrictions, with each process being algorithmic, not essentially interrupted, and with only sequential, conditional and repeating subprocesses. This paper suggests that a construct may be none, one or several of data, process and processor; and that syntax, semantics and behaviour of constructs be considered integrally. Process declarations are distinguished from process applications. Concurrency is natural. Process applications can be interrupted. Two process applications can overlap, or be strictly parallel, be freely parallel, clash, start together, or end together, or one can follow the other. All these possibilities are defined in terms of constructs such as when, before, after and during, each of which can apply to a process or construct; and local times can relate to an absolute time. As a consequence of rejection of immunity of the data model from the process structure certain anomalies may occur in the otherwise properly normalized data model. These anomalies, an access anomaly and a store anomaly, cannot be detected within the framework of the normalization theory based on functional, multivalued and join dependencies alone. This paper identifies and describes two new dependencies, tangled process dependency and flat process dependency that reflect behavioural properties of process application and offer a way to resolve the above anomalies." @default.
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- W2067710112 date "1988-01-01" @default.
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- W2067710112 title "Time in information systems and its impact on modelling processes and data" @default.
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- W2067710112 doi "https://doi.org/10.1016/0950-5849(88)90101-2" @default.
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