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PL/PgSQL. Previously, it had been bundled together with the assign statement implementation, for some reason that wasn't clear to me (they certainly don't share any code with one another). So I separated them and made PERFORM a statement like any other. No changes in functionality. Along the way, I added some regression tests for PERFORM, added a bunch more SGML tags to the PL/PgSQL docs, and removed an obsolete comment relating to the implementation of RETURN NEXT. Neil Conway