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Index › Programming Questions & Help › Syntax Questions › Error using xml library to read wikipedia
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Error using xml library to read wikipedia (Read 665 times)
Jimmy
Error using xml library to read wikipedia
May 20th, 2008, 6:09am  
Hello, I'm trying to parse wikipedia links with the xml library, but I'm getting an error when I try to load a wikipedia article. I'm using the following code:

import processing.xml.*;

void setup() {
String url = "http://en.wikipedia.org/wiki/Car";
XMLElement test = new XMLElement(this, url);
}

And I'm getting the following error:

processing.xml.XMLParseException: XML Parse Exception during parsing of a html element at line 82: Expected: /

Does anybody knows what is going on. I was able to read rss feeds but for some reason I can't read wikipedia articles. Is there any other option I could use besides the xml library?

Thanks
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mflux
Re: Error using xml library to read wikipedia
Reply #1 - May 20th, 2008, 8:06am  
You should probably use an html parser rather than an xml parser...

http://www.texone.org/prohtml/
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fluxhavoc  
PhiLho 
Re: Error using xml library to read wikipedia
Reply #2 - May 20th, 2008, 2:02pm  
It is strange because it is Valid XHTML 1.0 Transitional (according to W3C's checker), so it should be parsed as XML without problem.
And I see no problems at this line or around.
Might be a bug of the library, or something.

Using an HTML parser might be the right solution, indeed, they are more tolerant.
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antiplastik
Re: Error using xml library to read wikipedia
Reply #3 - May 21st, 2008, 1:22pm  
that happens when trying to parse tags that are containing text and other nested tags

Code:
<myXml>
  <p>this line will be parsed without any problem</p>
  <p>this line will throw a <b>XMLParseException</b></p>
</myXml>
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PhiLho 
Re: Error using xml library to read wikipedia
Reply #4 - May 21st, 2008, 2:41pm  
Ah But that's valid XML! Even newlines/indentations are text nodes in XML (IIRC).
Is that a limitation of XMLElement
Should we fall back on Java's XML library

[EDIT] OK, I see in XML Import that it uses NanoXML 2.2.3 Lite. The linked site states:
Quote:
NanoXML/Lite
   An extremely small (6KB) XML parser which is the successor of NanoXML 1. It only provides a limited functionality: no mixed content and the DTD is ignored.

I stressed the "no mixed content" part...
I suppose this library have been chosen for its small size... Or perhaps because it is of simpler use than other libraries.

Now, there are numerous XML parsers for Java, from XMLReader or the other NanoXML libraries to JDOM, dom4j, ElectricXML or XOM...
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« Last Edit: May 21st, 2008, 4:21pm by PhiLho  »  
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Jimmy
Re: Error using xml library to read wikipedia
Reply #5 - May 21st, 2008, 10:18pm  

Thanks, for your help, now I know why the xml parser wasn't working. I'm using proHTML now, and it has been working good so far. If I find something better I'll let you know.
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