And if it is permitted I can add to that and answer my own question: the meta data can be placed in the <head></head> section of the HTML file and calibre will read them in. There may be other standard fields, but the ones that really interest me, and work the way I expect them to are
<meta name="Title" content="The Title of the Book" />
<meta name="Author" content="Book Author" />
<meta name="Tags" content="Desired,Tags" />
<meta name="Date of publication" content="YYYY" />
Then to replace the volume in the calibre library I can delete the out-of-date version and get and convert the new version with updated metadata.
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