Calibre supports 'all' ebook formats such as .epub, etc. The test I did was for an epub, which explains why I saw no results in Zotero. L1 appears to only be used for .pdf files.
When I built ZMI I reverse engineered Zotero's JavaScript import adaptor for generic RIS files with a record type of 'BOOK'. Hence, L1 was not included as a supported tag for Calibre exports since it is not generic. I set M2 as {path}, which works perfectly for real ebooks.
What was the record type for your RIS file exported from Zotero that you immediately reimported? It should appear at the very top of each RIS record.
I might enhance the plugin to export an L1 tag if the Calibre ebook format is pdf if you can answer the questions above and below.
I would still like an answer as to where in Zotero you saw the L1 tag come to rest. What does it do for you? Exactly?
DaltonST
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