Re: rdfa parsing problem

[Ivan Herman]

Thanks a lot Philip. And thanks for the pointer, it may help in future if similar circumstances arise.

Thanks again

Ivan

Philip Taylor wrote:

The bad news (for me:-) is that the change the parser does on the DOM tree does not really explain the outcome of Meri's test, so there might be a bug in the rdfa distiller:-( I will have to check.

Ivan Herman wrote:

Meri Kovach wrote:

 <table>
    <tr>
    <span about="#2105555" typeof="foaf:Person">
       <td>1</td>
       <td><span property="foaf:firstName">Meri</span></td>
       <td><span property="foaf:familyName">Kovac</span></td>
   </span>
   </tr>
 </table>

[...]
The way the distiller works is that if hits
an XML (not XHTML!) error, it then switches (if allowed in the command
arguments) to an HTML5 parser and attempts to run the code through that
one, too. I guess (but I do not know) that the HTML5 parser attempts to
  make some sense in the erroneous code and I would presume it will
simply remove the <span> element from the DOM tree it produces.

  <span about="#2105555" typeof="foaf:Person"></span>
  <table>
    <tr>
      <td>1</td>
      ...
    </tr>
  </table>

That guess is almost right - with invalid input like this, the HTML5 parser moves the <span> to just before the <table>, so it's equivalent to: (You can test how html5lib parses HTML into a DOM tree using <http://james.html5.org/parsetree.html>)

--

Ivan Herman, W3C Semantic Web Activity Lead
Home: http://www.w3.org/People/Ivan/
mobile: +31-641044153
PGP Key: http://www.ivan-herman.net/pgpkey.html
FOAF: http://www.ivan-herman.net/foaf.rdf

smime.p7s
Description: S/MIME Cryptographic Signature