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MSXML RSS parsing problem

Posted on 2009-05-08
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Last Modified: 2013-11-11
I'm using this code to parse an RSS feed: {Delphi code}

    sCat2 := 'News & Events';
    oChannelNode               := RSSXML.selectsinglenode('rss').firstchild;
    oItemNodes := oChannelNode.selectNodes('//item[category = "'+sCat2+'"]');

    if oItemNodes.length > 0 then // oItemNodes.length is never > 3


It will only return THREE items even though I KNOW there are 4 in the XML.
Any ideas why?
The channel Node XML is posted below.

<channel>
  <SNIP>
  <item>
    <SNIP>
    <category><![CDATA[News & Events]]></category>
    <category><![CDATA[accounts payable]]></category>
    <category><![CDATA[California]]></category>
    <category><![CDATA[new update 8404]]></category>
    <category><![CDATA[New York]]></category>
    <category><![CDATA[Project Management software]]></category>
    <category><![CDATA[tax tables Arizona]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Company News]]></category>
    <category><![CDATA[News & Events]]></category>
    <category><![CDATA[certified payroll]]></category>
    <category><![CDATA[direct deposit]]></category>
    <category><![CDATA[excel time card import]]></category>
    <category><![CDATA[import job estimates]]></category>
    <category><![CDATA[magnetic media]]></category>
    <category><![CDATA[multi-state payroll]]></category>
    <category><![CDATA[subcontractor payment sheets]]></category>
    <category><![CDATA[Tra-Ser integration]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Construction Software]]></category>
    <category><![CDATA[complexities in construction]]></category>
    <category><![CDATA[construction accounting software]]></category>
    <category><![CDATA[entry level software]]></category>
    <category><![CDATA[QuickBooks]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Company News]]></category>
    <category><![CDATA[headquarters]]></category>
    <category><![CDATA[larger offices]]></category>
    <category><![CDATA[PR Newswire]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Construction Software]]></category>
    <category><![CDATA[AccuBuild]]></category>
    <category><![CDATA[commercial industrial construction company]]></category>
    <category><![CDATA[SQL database]]></category>
    <category><![CDATA[tips choosing software]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Stimulus Package & Construction]]></category>
    <category><![CDATA[AGC]]></category>
    <category><![CDATA[Arizona chapter]]></category>
    <category><![CDATA[Obama]]></category>
    <category><![CDATA[press conference]]></category>
    <category><![CDATA[Transportation Department]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[News & Events]]></category>
    <category><![CDATA[AccuBuild construction software]]></category>
    <category><![CDATA[construction software modules features]]></category>
    <category><![CDATA[existing new customer]]></category>
    <category><![CDATA[free users license]]></category>
    <category><![CDATA[special discounts promotion]]></category>
    <category><![CDATA[Spring Into Summer Sale]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[News & Events]]></category>
    <category><![CDATA[attendees]]></category>
    <category><![CDATA[construction industry news]]></category>
    <category><![CDATA[Construction Software]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Stimulus Package & Construction]]></category>
    <category><![CDATA[3.4 billion]]></category>
    <category><![CDATA[construction on sale]]></category>
    <category><![CDATA[economic stimulus package construction companies]]></category>
    <SNIP>
  </item>
  <item>
    <SNIP>
    <category><![CDATA[Construction Software]]></category>
    <category><![CDATA[construction companies profitable]]></category>
    <category><![CDATA[construction specific software]]></category>
    <category><![CDATA[Equipment Module]]></category>
    <category><![CDATA[generating income]]></category>
    <SNIP>
  </item>
</channel>

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Question by:EddieShipman
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2 Comments
 
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Accepted Solution

by:
CraigYellick earned 500 total points
ID: 24339910
I tested your XML (after deleting all the SNIP) using MS .NET and the expression:

   //item[category='News & Events']

returns 4 item elements, not three. Reasons the expression might yield only 3 hits:

* oChannelNode does not point to the entire XML document you've indicated
* one of the item elements is not lower-case or otherwise exactly "item"
* same as the above for one of the category elements
* the category element content might not be exactly "News & Events"

Try using the following expression (which ignores the item and category element names) and see if it finds 4 items:

  //*[text()='News & Events']

You could also try the above against the RSSXML object and not oChannelNode.

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Author Comment

by:EddieShipman
ID: 24359478
I reworked how I'm doing everything and thus am now satisfied with the results.
I get each category's feed using the ?cat=XXX&feed=rss2 url and then append the items from each into one XML document and then I am able to check for the //item[category = xxx] correctly.
Thanks for the heads up, though.
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