This link comes from John Beardsworth's RSS feed. Apple has made some significant changes with the manner in which Aperture handles metadata in Apertur 3. The implementation will likely cause difficulties to photographers who work with other editing or cataloging programs or who share their metadata-rich files to others that need to be able to access the full range of metadata information.

http://www.controlledvocabulary.com/imagedatabases/aperture3.html 

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