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A knowledge structure is an interrelated collection of facts or knowledge about a particular topic. It is composed of concepts linked to other concepts by labeled relationships. A concept may be related to any number of other concepts via any number of relationships. In this manner a knowledge structure takes the form of a simplified semantic network.
Unstructured documents, such as word processing documents or JPG images, may be attached to this structure, just as a file may be attached to an email message; these become special nodes in the network known as knowledge objects.