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    dc:title="Semantic Data Extractor"
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    dc:description="Every so often, someone writes to me or to the public-qa-dev mailing list to report bugs, or simply to give thanks on the semantic data extractor. I&apos;m always pleasantly surprised when I hear that, what started as a 10 minutes..."
    dc:creator="Dominique Hazaël-Massieux"
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                        <h2 class="entry-header">Semantic Data Extractor</h2>
                           <div class="entry-body">
                              <p>Every so often, someone writes to me or to the <a href="http://lists.w3.org/Archives/Public/public-qa-dev/">public-qa-dev mailing list</a> to report bugs, or simply to give thanks on the <a href="http://www.w3.org/2003/12/semantic-extractor.html">semantic data extractor</a>.</p>
<p>I'm always pleasantly surprised when I hear that, what started as a 10 minutes demonstrator of the semantics attached to HTML, is actually used as a tool by a number of developers.</p>
<p>With a name such "semantic data extractor", it was a bit of a shame that the tool didn't highlight the usage of <a href="http://www.w3.org/TR/2007/NOTE-grddl-primer-20070628/">GRDDL</a> or <a href="http://www.w3.org/TR/2008/NOTE-xhtml-rdfa-primer-20081014/">RDFa</a> on pages that use either of these technologies; I have just added detection of both of these to the extractor.</p>
<p>As a bonus, I have also added detection of non-semantic markup: at this time, it will detect purely-wrapping <code>&lt;div&gt;</code>, empty <code>&lt;span&gt;</code>, and tables with a single row or a single column (which have good chances to be layout tables); if you have suggestions for detecting other non-semantic markup, let me know!</p>

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                       <p class="postinfo">Filed by <a href="http://www.w3.org/People/Dom/">Dominique Hazaël-Massieux</a> on February 12, 2009 10:27 AM in <a href="http://www.w3.org/QA/archive/technology/semantic_web/">Semantic Web</a>, <a href="http://www.w3.org/QA/archive/w3cqa_news/tools/">Tools</a><br />
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                                 | <a href="http://www.w3.org/QA/2009/02/semantic_data_extractor.html#comments">Comments (7)</a>
                                 | <a href="http://www.w3.org/QA/2009/02/semantic_data_extractor.html#trackback">TrackBacks (0)</a>
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<h3 class="comments-header" id="comments">Comments</h3>
<div class="comment" id="comment-176213">
<p class="comment-meta" id="c176213">
<span class="comment-meta-author"><strong>Carlo </strong></span>
<span class="comment-meta-date"><a href="#c176213">#</a> 2009-03-13</span>
</p>
<div class="comment-bulk">
<p>The tool doesn't work!
This is the error message:</p>

<p>Using org.apache.xerces.parsers.SAXParser
Exception net.sf.saxon.trans.DynamicError: org.xml.sax.SAXParseException: Content is not allowed in prolog.
org.xml.sax.SAXParseException: Content is not allowed in prolog.</p>

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<div class="comment" id="comment-176245">
<p class="comment-meta" id="c176245">
<span class="comment-meta-author"><strong>Dom </strong></span>
<span class="comment-meta-date"><a href="#c176245">#</a> 2009-03-13</span>
</p>
<div class="comment-bulk">
<p>Hi Carlo,</p>

<p>Please report bugs and errors on public-qa-dev@w3.org, with details on the URI you tried the tool on.</p>

<p>Thanks,</p>

<p>Dom</p>

</div>
</div>


<div class="comment" id="comment-180797">
<p class="comment-meta" id="c180797">
<span class="comment-meta-author"><strong>OP </strong></span>
<span class="comment-meta-date"><a href="#c180797">#</a> 2009-04-09</span>
</p>
<div class="comment-bulk">
<p>Hi there.</p>

<p>I am a big fan of this tool. But something that is puzzling me is this message we are getting for our site(s) when running them through.</p>

<p>" with no additional content to their unique child"</p>

<p>Gotta love it.  Naturally I checked out a few things and tried what I thought might fix this from appearing, and to no avail.</p>

<p>The divs I have are empty in a sense... they have this.  Since the include file is in </p>


<p>So I tried to add a few things into the div container... nbsp's, transparent gifs, other content, and still nothing was reducing the amount of divs with no additional content.</p>

<p>The included file doesnt consist of having empty divs inside it.</p>

<p>Other divs have content in them with headers and such, so I think that the div i mentioned may be throwing it off.</p>

<p>Any suggestions what to do to remedy this?  </p>

</div>
</div>


<div class="comment" id="comment-182614">
<p class="comment-meta" id="c182614">
<span class="comment-meta-author"><strong>Joe </strong></span>
<span class="comment-meta-date"><a href="#c182614">#</a> 2009-07-08</span>
</p>
<div class="comment-bulk">
<p>I second OP's comment.
I have no clue what this error means, having tried the same as OP:</p>

<p>Non-semantic markup</p>

<p>The following suspiciously non-semantic markup has been detected:</p>

<pre>* 6 &lt;div&gt; with no additional content to their unique child
</pre>

<p>Any advice?
Someone?
Thanks!</p>

</div>
</div>


<div class="comment" id="comment-182615">
<p class="comment-meta" id="c182615">
<span class="comment-meta-author"><strong>Dom </strong></span>
<span class="comment-meta-date"><a href="#c182615">#</a> 2009-07-08</span>
</p>
<div class="comment-bulk">
<p>I have removed the test for empty div, as it was both confusing and misleading.</p>

</div>
</div>


<div class="comment" id="comment-209881">
<p class="comment-meta" id="c209881">
<span class="comment-meta-author"><strong>James Sanders </strong></span>
<span class="comment-meta-date"><a href="#c209881">#</a> 2011-01-01</span>
</p>
<div class="comment-bulk">
<p>Hello All,</p>

<p>Well, after 3 hours of searching through W3C to try to figure out what is wrong and why the semantics validator keeps throwing errors, I finally decided to post here in hopes that some answers might be forthcoming. Hopefully, with Q@A being closed, this still gets some attention. So without further delay, the error I get is as follows:</p>

<p>Using org.apache.xerces.parsers.SAXParser
Exception net.sf.saxon.trans.XPathException: org.xml.sax.SAXParseException: The markup declarations contained or pointed to by the document type declaration must be well-formed.
org.xml.sax.SAXParseException: The markup declarations contained or pointed to by the document type declaration must be well-formed.</p>

<p>URI link to the file in question is as follows:
<a href="http://www.sanders-consultation-group-plus.com/redesign/grail-template.html" rel="nofollow">http://www.sanders-consultation-group-plus.com/redesign/grail-template.html</a></p>

<p>Any help in this matter would be greatly appreciated because I do so much love the idea of running pages through the validator. It really does give a designer an idea of what spiders might think a page is about based on the semantics, and lets me know, as a designer, if I have done my job to make sure they know.</p>

<p>Thanks in advance</p>

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<div class="comment" id="comment-209937">
<p class="comment-meta" id="c209937">
<span class="comment-meta-author"><strong>Dom </strong></span>
<span class="comment-meta-date"><a href="#c209937">#</a> 2011-01-03</span>
</p>
<div class="comment-bulk">
<p>The problem reported by James seems to be coming from an invalid/ill-formed XHTML document, see <a href="http://lists.w3.org/Archives/Public/public-qa-dev/2011Jan/0001.html" rel="nofollow">http://lists.w3.org/Archives/Public/public-qa-dev/2011Jan/0001.html</a></p>

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