Knowledge Issues: Acquisition, Representation, and Manipulation
Some of the data now being made accessible to individuals via the Internet is structured in relational databases. Most kinds of data exist as textual and graphical documents, video, speech, and other specialized data stores. All of these data sources, however, range from relatively unstructured to moderately structured. Relational databases, which have both an intensional database (the generic information or schema, that is, part of the metadata) and an extensional database (the instances or tuples of the schema), still greatly rely either on application code for the semantic interpretation of their data or, as is the case in general for documents and relatively less structured data, ...
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