| http://www.w3.org/ns/prov#value | - A major challenge for RDBMSs is to provide a model and implement a technique so that user-defined data (i.e., data which is based on user-defined types and which is not known to the RDBMS when the RDBMS is built) qualified by user-defined functions (i.e., functions that are defined by a user and that are not known to the RDBMS when the RDBMS is built) can be located quickly and efficiently.
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