Awesome that catalog includes empties. Awesomer that "wishlist" tag might highlight them. I'll try that. My confusion stems from my not previously defining or knowing what universes each operation lives in. (save to disk, send to device, conversion, cataloging) There is a set of items called bookID. There is a set of items called metadatabookID (or whatever you call it) that includes both empty-of-format and formats-exist. The universe of metadatabookID is larger than bookID. The universe of bookID doesn't include metadatabookID if empty-of-format. Some operations use one universe, other operations use another universe.
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