E-book Listed for Kind

What format is a document listed as an “E-book” for its Kind? And, how are these identified as a criterion for a Smart Group?

I suppose its epub. Otherwise it would be mobi (not very probable) or PDF (which is PDF, anyway). Amazons format is proprietary, so that’s a no-no.

Thanks @chrillek. Yes epub of some sort and also XML metadata files from Calibre. Both identified as “E-book” by DT3.

And a related follow-up question: Is the “Other” criterion in Smart Groups a catchall for anything else that is not listed under Kind?

That is correct.

A Smart Group of “Kind is Other” produces thousands of files, mostly Compiled HTML, exec, DXF, java, and text in my case. But also included are E-book files. Is there a way to specifically just retrieve those?

Use Extension is…

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Thanks Jim. So, is it generally better to use Extensions and not Kind to identify this type of file?

If you’re looking for a more focused file formats, then I would use the Extension attribute.