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POWhy does .NET schema validation claim that the namespace:lang attribute is not declared?
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  1. POWhy does .NET schema validation claim that the namespace:lang attribute is not declared?
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    copied!<p>I try to validate an XML document against the schema named MedisinskeOpplysninger-v1.5.xsd from this collection: <a href="http://www.kith.no/upload/1611/v1.5/PLO-schema%20v1.5.zip" rel="nofollow">http://www.kith.no/upload/1611/v1.5/PLO-schema%20v1.5.zip</a></p> <p>Basically, I add the referenced schemas to a SchemaSet in C#, and validate my XML by assigning the SchemaSet to the corresponding property of the XmlReaderSettings and run an XmlReader. </p> <p>I get the following error message: </p> <pre><code>System.Xml.Schema.XmlSchemaException : The 'http://www.w3.org/XML/1998/namespace:lang' attribute is not declared. at System.Xml.Schema.XmlSchemaSet.InternalValidationCallback(Object sender, ValidationEventArgs e) at System.Xml.Schema.BaseProcessor.SendValidationEvent(XmlSchemaException e, XmlSeverityType severity) at System.Xml.Schema.BaseProcessor.SendValidationEvent(XmlSchemaException e) at System.Xml.Schema.Compiler.CompileElement(XmlSchemaElement xe) at System.Xml.Schema.Compiler.Compile() at System.Xml.Schema.Compiler.Execute(XmlSchemaSet schemaSet, SchemaInfo schemaCompiledInfo) at System.Xml.Schema.XmlSchemaSet.Compile() </code></pre> <p>I see in Fiddler that .NET is trying to download xml.xsd from w3c.org, but fails (the server responds with a 504), so I have tried to download xml.xsd and include it explicitly in my SchemaSet. When I try this, .NET claims that </p> <pre><code>The global attribute 'http://www.w3.org/XML/1998/namespace:lang' has already been declared. </code></pre> <p>I am confused. Any ideas?</p> <p>I'm on .NET 3.5, C#, Visual Studio 2010, Windows 7.</p> <p><strong>Update</strong></p> <p>I have tried Ian's suggestion per the comments, and added the custom resolver from <a href="http://londata.svnrepository.com/xmlcatalog.net/trac.cgi/wiki/WikiStart" rel="nofollow">LonData</a>. I can see by watching the Fiddler trace that it is indeed in effect, since no attempt to resolve schemas from external addresses happens now. </p> <p>I now get the following error message: The 'http://www.w3.org/2000/09/xmldsig#:Signature' element is not declared.</p> <p>My XML catalog file looks like this:</p> <pre><code>&lt;catalog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"&gt; &lt;systemSuffix systemIdSuffix="XMLSchema.xsd" uri="C:\Users\eax\AppData\Local\Temp\XMLSchema.xsd"/&gt; &lt;systemSuffix systemIdSuffix="datatypes.dtd" uri="C:\Users\eax\AppData\Local\Temp\datatypes.dtd"/&gt; &lt;systemSuffix systemIdSuffix="XMLSchema.dtd" uri="C:\Users\eax\AppData\Local\Temp\XMLSchema.dtd"/&gt; &lt;systemSuffix systemIdSuffix="Xmldsig.xsd" uri="C:\Users\eax\AppData\Local\Temp\Xmldsig.xsd"/&gt; &lt;systemSuffix systemIdSuffix="xmldsig-core-schema.xsd" uri="C:\Users\eax\AppData\Local\Temp\xmldsig-core-schema.xsd"/&gt; &lt;systemSuffix systemIdSuffix="xml.xsd" uri="C:\Users\eax\AppData\Local\Temp\xml.xsd"/&gt; &lt;systemSuffix systemIdSuffix="xhtml1-strict.xsd" uri="C:\Users\eax\AppData\Local\Temp\xhtml1-strict.xsd"/&gt; &lt;/catalog&gt; </code></pre>
 

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