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A Librarian's Guide to Graphs, Data and the Semantic Web by James Powell

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17

Time

Time requires special consideration in computing. Business systems that use relational databases must stay synchronized and use consistent ways of representing a point in time, an interval of time that has a start and endpoint, and for indicating that something holds true to the present time, or that a start or endpoint is undefined. Comparing points in time is relatively straightforward, but intervals are a different matter entirely. Allen’s Temporal Intervals defines the various ways that time intervals can be related to one another, such as meets, overlaps with, contains, and after. This model enabled reasoning about time intervals. Graphs are often used to model complex systems, and complex systems are usually dynamic systems that ...

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