XmlSchemaInference bug

exception.txt

The type attribute cannot be present with either simpleType or complexType.
   at System.Xml.Schema.XmlSchemaSet.InternalValidationCallback(Object sender, ValidationEventArgs e)
   at System.Xml.Schema.BaseProcessor.SendValidationEvent(XmlSchemaException e, XmlSeverityType severity)
   at System.Xml.Schema.Preprocessor.PreprocessElementContent(XmlSchemaElement element)
   at System.Xml.Schema.Preprocessor.PreprocessLocalElement(XmlSchemaElement element)
   at System.Xml.Schema.Preprocessor.PreprocessParticle(XmlSchemaParticle particle)
   at System.Xml.Schema.Preprocessor.PreprocessComplexType(XmlSchemaComplexType complexType, Boolean local)
   at System.Xml.Schema.Preprocessor.PreprocessElementContent(XmlSchemaElement element)
   at System.Xml.Schema.Preprocessor.PreprocessLocalElement(XmlSchemaElement element)
   at System.Xml.Schema.Preprocessor.PreprocessParticle(XmlSchemaParticle particle)
   at System.Xml.Schema.Preprocessor.PreprocessComplexType(XmlSchemaComplexType complexType, Boolean local)
   at System.Xml.Schema.Preprocessor.PreprocessElementContent(XmlSchemaElement element)
   at System.Xml.Schema.Preprocessor.PreprocessElement(XmlSchemaElement element)
   at System.Xml.Schema.Preprocessor.Preprocess(XmlSchema schema, String targetNamespace, ArrayList imports)
   at System.Xml.Schema.Preprocessor.Execute(XmlSchema schema, String targetNamespace, Boolean loadExternals)
   at System.Xml.Schema.XmlSchemaSet.PreprocessSchema(XmlSchema& schema, String targetNamespace)
   at System.Xml.Schema.XmlSchemaSet.Reprocess(XmlSchema schema)
   at System.Xml.Schema.XmlSchemaInference.InferSchema1(XmlReader instanceDocument, XmlSchemaSet schemas)
   at System.Xml.Schema.XmlSchemaInference.InferSchema(XmlReader instanceDocument, XmlSchemaSet schemas)
   at UserQuery.Main()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

repro.cs

// https://connect.microsoft.com/VisualStudio/feedback/details/1691659

void Main()
{
	var inference = new XmlSchemaInference();
	var schemaSet = new XmlSchemaSet();

	using (var reader = new XmlTextReader(new StringReader(@"
<doc>
	<table>
		<cols />
	</table>
</doc>
")))
	{
		inference.InferSchema(reader, schemaSet);
	}
	
	using (var reader = new XmlTextReader(new StringReader(@"
<doc>
	<table>
		<cols>text</cols>
	</table>
	<table>
		<cols total=""true"">text</cols>
	</table>
</doc>
")))
	{
		inference.InferSchema(reader, schemaSet); // crashes here
	}
}