feat: "xmp" is no longer a valid package link property #1468
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The following entries were removed from the metadata link vocabulary in EPUB 3.3, due to low usage report:
This commit removes the "xmp" from the link property vocabulary, so any use of it will be reported as an error.
It keeps the "acquire" property in the relationship vocabulary, for backward compatibility notably with the EPUB Previews specification were it is defined.
Close #1457