Loading not-so-well-formed XML into XDocument (multiple DTD)
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by Gart
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Published on 2010-04-21T16:07:16Z
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2010/04/21
16:13 UTC
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I have got a problem handling data which is almost well-formed XHTML document except for it has multiple DTD declarations in the beginning:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
...
</head>
<body>
...
</body>
</html>
I need load this data into XDocument object using only the first DTD and ignoring the rest declarations. It is not possible to completely ignore DTD processing because the document may have unusual characters like â or € etc.
The text is retrieved from external source and I have no idea why it comes like this.
Obviously my naive attempt to load this document fails with System.Xml.XmlException : Cannot have multiple DTDs:
var xmlReaderSettings = new XmlReaderSettings
{
DtdProcessing = DtdProcessing.Parse
XmlResolver = new XmlPreloadedResolver(),
ConformanceLevel = ConformanceLevel.Document,
};
using (var xmlReader = XmlReader.Create(stream, xmlReaderSettings))
{
return XDocument.Load(xmlReader);
}
What would be the best way to handle this kind of data?
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