URL in COinS

At the Brief guide to Implementing OpenURL 1.0 Context Object for Journal Articles is written: "A URL may be the only usable identifier for an online article, in which case the URL can be treated as an identifier for the article (i.e. "rft_id=http://www.firstmonday.org/ issues/issue6_2/odlyzko/ index.html")."

I tried to add rft_id to Biom.cz but the URL is not recognized by Zotera. I tested also rft_identificator, but without success.

Example of implementation of COinS at Biom.cz:

<span class="Z3988" title="ctx_ver=Z39.88-2004&amp;
rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;
rfr_id=info%3Asid%2Focoins.info%3Agenerator&amp;
rft.genre=article&amp;
rft.atitle=Bioplyn z konského hnoja s kukuričnou silážou v procese anaeróbnej kofermentácie&amp;
rft.title=Biom.cz&amp;
rft.stitle=Biom.cz&amp;
rft.issn=1801-2655&amp;
rft.date=2007-11-23&amp;
rft.volume=9&amp;
rft.issue=11&amp;
rft.au=Ladislav Košík&amp;
rft.au=Ján Gaduš&amp;
rft.id=http://biom.cz/clanky.stm?x=2058843&amp;
rft.language=Czech"></span>

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