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A pragma is a compiler directive that tells Oracle to use rules, other than the default rules, for the object.
The following links are to library pages where there are demos of various Oracle pragma statements. Non-linked items are topics for further research.
A page has not been added at this point-in-time to explain PRAGMA UNSUPPORTED so in its place the following note has been added based on Oracle's online docs.
"Procedures and packages with the pragma UNSUPPORTED stop apply at the point of procedure invocation so that manual intervention can be taken."