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How should the "\ t" character in XML attribute values ​​be handled?

It seems I found something mismatch between the various XML implementations inside .NET 3.5, and I'm struggling to figure out what is nominally correct.

The problem is actually quite easy to reproduce:

  • Create a simple XML document with a text element containing the characters '\ t' and assign it an attribute containing the characters '\ t':

    var xmlDoc = new XmlDocument { PreserveWhitespace = false, };
xmlDoc.LoadXml("<test><text attrib=\"Tab'\t'space' '\">Tab'\t'space' '</text></test>");
xmlDoc.Save(@"d:\TabTest.xml");

    NB: This means that the XmlDocument itself is quite happy with the characters '\ t' in the attribute value.

  • Download the document using the new XmlTextReader:

    var rawFile = XmlReader.Create(@"D:\TabTest.xml");
var rawDoc = new XmlDocument();
rawDoc.Load(rawFile);

  • Download the document using XmlReader.Create:

    var rawFile2 = new XmlTextReader(@"D:\TabTest.xml");
var rawDoc2 = new XmlDocument();
rawDoc2.Load(rawFile2);

  • Compare documents in the debugger:

    (rawDoc).InnerXml   "<test><text attrib=\"Tab' 'space' '\">Tab'\t'space' '</text></test>"   string
(rawDoc2).InnerXml  "<test><text attrib=\"Tab'\t'space' '\">Tab'\t'space' '</text></test>"  string

XmlTextReader , , "\ t" , . , , XmlReader.Create, , "\ t" ' '.

....!!: -)

After a bit of a Google search found that could encode a '\t' as '&#x9;' - if used this instead of '\t' in the example XML both readers work as expected.

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, save code :

var xmlDoc = new XmlDocument { PreserveWhitespace = false, };
xmlDoc.LoadXml("<test><text attrib=\"Tab'\t'space' '\">Tab'\t'space' '</text></test>");

using (var xmlWriter = XmlWriter.Create(@"d:\TabTest.Encoded.xml"))
{
    xmlDoc.Save(xmlWriter);
}

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