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Aspect is used to distinguish among sets of features of a domain or subject area. The term is borrowed from "aspect-oriented" programming, where it is used to separate concerns. An ontology may be characterized by this dimension so as to parition features that are orthogonal. For example, in a systems ontology there may be aspects for "structure", "function", "behavior" and "interface" or "interoperability". A viewpoint can be distinguished by "aspects". For example the "information viewpoint" of an application can be partitioned into separate graphs for the "security", "operational" and"data retention" aspects.
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