libpqtypes was originally introduced as a patch for libpq adding support for automatic conversion of types and the ability to run queries in a printf/scanf interface. After a spirited discussion, it was determined that libpqtypes should be split between a separate library, which now lives on pgfoundry, and a libpq events system which was accepted into libpq.
libpqtypes was donated to the PostgreSQL project courtesy of eSilo.
PgFoundry project page:
libqtypes online documentation:
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