While trying to investigate whether Amazon formats the DCMI same as epub, I opened up a AZW3 previously acquired from Kindle, imported into Calibre (de'drm'd):
Code:
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:calibre="http://calibre.kovidgoyal.net/2009/metadata" xmlns:opf="http://www.idpf.org/2007/opf">
<dc:title>Third Contact (Envoys Book 1)</dc:title>
<dc:creator opf:role="aut" opf:file-as="Aldin, Peter J">Peter J Aldin</dc:creator>
<dc:contributor opf:role="bkp" opf:file-as="calibre">calibre (6.11.0) [https://calibre-ebook.com]</dc:contributor>
<dc:identifier id="calibre_id" opf:scheme="calibre">50ef213d-0a34-449c-9f3b-02e48a8f203d</dc:identifier>
<dc:date>2020-11-14T00:00:00-04:00</dc:date>
<dc:language>eng</dc:language>
<dc:identifier opf:scheme="MOBI-ASIN">B08KNYV3LX</dc:identifier>
Does this indicate that Calibre inserted them upon either import or opening an un-imported AZW3 in ebook-editor?
Also, what is
http://calibre.kovidgoyal.net/2009/metadata? It redirected to the front page. If I change it to https and click past the invalid certificate error it leads to a 404 page.