@DiapDealer...By bookmarks we mean ids.
What Becky is referring to is the the odd Calibre id that is inserted in Becky's cover.xhtml meta tag in her scrambled.epub document. The layout of the cover.xhtml file looks like this:
Becky is insistent that I should fix the above issue, which is actually caused by the Calibre conversion of her original doc to epub. This problem is caused by Calibre's non-standard use of meta ids in other words. I really don't know why that "calibre:cover" id is there in the meta tags of the cover file. It's obviously an irregular id that has been put there by Kovid Goyal for reasons that I am unable to fathom.
I can certainly put in a fix for this problem(by simply removing the offending meta line in the cover file) but it does irk me that such a non-standard and obviously fudged id is being generated by Calibre in all its conversions to epub which cause problems when my plugins are being used.