XmlReaderSettings does not resolve an xs:import with http://... location

EDN Admin · Oct 16, 2008

Hi,
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Im trying to validate an Xml document using an XmlReader. Here is my code:

private void Validate(TextReader source, string xsd)
{
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XmlReaderSettings settings = new XmlReaderSettings();
XmlUrlResolver resolver = new XmlUrlResolver();
settings.ProhibitDtd = false;
resolver.Credentials = CredentialCache.DefaultCredentials;
settings.XmlResolver = resolver;
settings.ValidationFlags = XmlSchemaValidationFlags.ProcessSchemaLocation;
settings.ValidationFlags |= XmlSchemaValidationFlags.ReportValidationWarnings;
settings.Schemas.XmlResolver = resolver;
settings.Schemas.Add(null, xsd);
settings.Schemas.Compile();
//settings.Schemas.Add(null, <a title="http://www.w3.org/2001/xml.xsd http://www.w3.org/2001/xml.xsd http://www.w3.org/2001/xml.xsd );
settings.ValidationType = ValidationType.Schema;
settings.ValidationEventHandler += ValidationHandler;
XmlReader reader = XmlReader.Create(source, settings);

while (reader.Read())
{
}
 </blockquote>
}

The xsd of the xml document I want to validate contains an xs:import that points to local xsd (the schemaLocation is, as example "./dc.xsd"). This xsd imports serveral other xsd, one of which is the following:

<xs:import namespace="<a title="http://www.w3.org/XML/1998/namespace http://www.w3.org/XML/1998/namespace http://www.w3.org/XML/1998/namespace "
schemaLocation="<a title="http://www.w3.org/2001/03/xml.xsd http://www.w3.org/2001/03/xml.xsd http://www.w3.org/2001/03/xml.xsd
</xs:import>

When settings.Schemas.Add(null,xsd) is executed, all nested LOCAL xsd are correctly resolved by the XmlUrlResolver I created. If i inspect during debug my XmlReaderSetting instance i can see tha all the required xsd are correctly loaded, EXCEPT <a title="http://www.w3.org/2001/03/xml.xsd http://www.w3.org/2001/03/xml.xsd http://www.w3.org/2001/03/xml.xsd . Then settings.Schemas.Compile() is executed, an exception is raised telling me that the attribute xml:lang is not defined (its defined in the missing xsd).
This exception is not raised, and validaion is performed correctly, if i manually add the namespace (see the commented line of my code), or if i change the scema location in the xsd file to point to a local copy of xml.xsd (schemaLocation="./xml.xsd").

I would like to know how can I make this work, because i dont want to add manually anything related to this specific scenario (i.e. i would like to reuse the code). In other words, why this remote location is not resolved?

 </blockquote>

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XmlReaderSettings does not resolve an xs:import with http://... location

EDN Admin

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