Embedded schema failing

Question

Hi all;

Please look at the file www.windward.net/temp/EmbeddedSchema.xml which has an embedded schema. When we feed it to 

XmlReaderSettings settings = new XmlReaderSettings {ProhibitDtd = false};
		settings.ValidationType = ValidationType.Schema;
		settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessInlineSchema |
									XmlSchemaValidationFlags.ReportValidationWarnings |
									XmlSchemaValidationFlags.AllowXmlAttributes;

using (XmlReader reader = XmlFileOpen.XmlReaderCreate(xmlUrl, settings, ConnectMode, credentials.FullName, credentials.Password))
{
	while (reader.Read())
		// nada
		;
}

We get:

System.Xml.Schema.XmlSchemaValidationException occurred
  Message=An element or attribute information item has already been validated from the '' namespace. It is an error if 'xsi:schemaLocation', 'xsi:noNamespaceSchemaLocation', or an inline schema occurs for that namespace.
  Source=System.Xml
  LineNumber=460
  LinePosition=5
  SourceUri=file:///C:/test/Report.xml
  StackTrace:
       at System.Xml.Schema.XmlSchemaValidator.SendValidationEvent(XmlSchemaValidationException e, XmlSeverityType severity)
       at System.Xml.Schema.XmlSchemaValidator.SendValidationEvent(String code, String msg, XmlSeverityType severity)
       at System.Xml.Schema.XmlSchemaValidator.AddSchema(XmlSchema schema)
       at System.Xml.XsdValidatingReader.ProcessInlineSchema()
       at System.Xml.XsdValidatingReader.Read()
       at WindwardArrow.net.windward.arrow.datasource.xml.XmlDataSourceInfo.CanConnect() in C:\src\jenova\11.1\Merge\WindwardArrow\net\windward\arrow\datasource\xml\XmlDataSourceInfo.cs:line 515
  InnerException: 

I've read up a bunch on embedded schemas but while I found lots of examples, I can't find anything that lays out what is allowed and all ways this can be done. I'm assuming that the namespace needs to be specified in the root node but I tried that and it didn't work.

Any suggestions?

thanks - dave

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Answer 1

One way to resolve this is set some namespace.

Verified with following code.

class Program
{
    static void Main(string[] args)
    {
        string file = "EmbeddedSchema.xml";

        XmlReaderSettings settings = new XmlReaderSettings { DtdProcessing = DtdProcessing.Ignore };
        settings.ValidationType = ValidationType.Schema;
        settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessInlineSchema |
                                    XmlSchemaValidationFlags.ReportValidationWarnings |
                                    XmlSchemaValidationFlags.AllowXmlAttributes;

        using (XmlReader reader =  XmlReader.Create(file, settings))
        {
            while (reader.Read() && reader.Name != "FirmID_Primary")
            {
                Console.WriteLine(reader.Name);
            }
        }

    }
}

And here's the start of the XML file, notice added http://sample.com/xml namespace.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<NewDataSet xmlns="http://sample.com/xml">
  <xs:schema id="NewDataSet" xmlns="http://sample.com/xml" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="Job">
            <xs:complexType>
              <xs:sequence>

Answer 2

Thank you.

ps - is xmlns="" legal? Seems logical that an empty string counts as a url. But it feels wrong.

---

Who will win The Windward International Collegiate Programming Championships?