This section addresses the types of that are required to enable effective use of the hierarchies and definitions when retrieving data.
The actual process of data retrieval is a , rather than a because it involves interactions with a database containing instance data (e.g. an or data warehouse repository). However, queries may use predicates that specify of particular or specify that have particular defining . In order to resolve these queries, the application will need to provide or use , adapted to the implementation model in use. The use of either a local extension with a "Managed content addition" strategy, or strategy with an reference table, has an effect on the required set of .
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