<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On 18.03.2007, at 13:53, Andy Mabbett wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV>It's my understanding that 10-digit ISBNs (a published in millions of books and journals and many thousands, if not millions, of websites) are still valid. Can you provide specific a citation otherwise, please?</DIV></BLOCKQUOTE><DIV><BR class="khtml-block-placeholder"></DIV>Hi Andy,</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>the citation was in my mail:<BR><BR></DIV><BLOCKQUOTE type="cite"><DIV><SPAN class="Apple-style-span">As of January 1, 2007, all book and book-related products <B>must</B> carry 13-digit ISBNs.</SPAN></DIV><DIV><BR></DIV><DIV><SPAN class="Apple-style-span">All 10-digit ISBNs <B>in circulation</B> will have the 3-digit EAN prefix "978" <B>added</B> (which currently represents the book industry). This 13-digit ISBN is already represented, and will be identical, to current EAN bar codes carrying ISBN with the "978" prefix.</SPAN></DIV><DIV><BR></DIV><DIV><SPAN class="Apple-style-span"><B>All 10-digit ISBNs must be converted</B> to the 13-digit format and all systems will need to accommodate its use in this format. To easily convert your 10-digit ISBNs to 13-digits use a conversion utility.</SPAN></DIV></BLOCKQUOTE><DIV><BR></DIV><DIV><A href="http://www.niso.org/standards/resources/ISBN.html">http://www.niso.org/standards/resources/ISBN.html</A></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>or: <A href="http://www.isbn.org/standards/home/isbn/transition.asp">http://www.isbn.org/standards/home/isbn/transition.asp</A></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Of course systems should still read 10 digit ISBNs, but only 13 digit ISBNs are issued.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>This is not a problem for your proposed microformat per se, but I just wanted to make sure</DIV><DIV>everyone involved in the discussion which will start around your isbn format is up to date</DIV><DIV>on current ISBN standards. Also a extension which reads ISBN numbers should/must</DIV><DIV>automatically convert any 10 digit ISBNs to their 13 digits equivalent for use with other</DIV><DIV>systems.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I think disallowing 10 digit ISBNs in the microformat is not a good idea as there may be</DIV><DIV>websites that want to mark up their existing ISBN lists.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Best,</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Alexander Graf</DIV><DIV><BR><DIV><DIV><FONT class="Apple-style-span" color="#008000" face="HelveticaNeue-Light"><B>DERI</B></FONT><FONT class="Apple-style-span" face="HelveticaNeue-Light"><B> Innsbruck</B></FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light">Digital Enterprise Research Institute</FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light">Leopold-Franzens-Universität</FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light">ICT Technologiepark, Technikerstrasse 21a</FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light">6020 Innsbruck, Austria</FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light"><B>mail</B></FONT><FONT class="Apple-style-span" face="HelveticaNeue-Light">: <A href="mailto:alexander.graf@deri.org">alexander.graf@deri.org</A></FONT></DIV><DIV><FONT class="Apple-style-span" face="HelveticaNeue-Light"><B>web</B></FONT><FONT class="Apple-style-span" face="HelveticaNeue-Light">: <A href="http://www.deri.at">www.deri.at</A></FONT></DIV></DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV></BODY></HTML>