you wrote your post in 2012, it is now end of January 2014 and I am seeking some kind of glossary of terms I can use for creating ISO 19139 metadata, I often do not find enough information in the editing environment to clarify what exactly I am supposed to enter. It seems like there should be some kind of reference material, a glossary of terms...something more detailed than the clues offered. But I am not finding. I don't know if your quest was similar or different. Did you find any answers?