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Editorial Team
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Asked: 2026-05-15T23:40:00+00:00

I am developing a system that will receive a XML (XmlDocument) via webservice. I

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I am developing a system that will receive a XML (XmlDocument) via webservice. I won’t have this XML (XmlDocument) on hardisk. It will be managed on memory.

I have a file XSD to validate the XML (XmlDocument) that I receive from my WebService. I am trying to do a example to how validate this Xml.

My XML:

<?xml version="1.0"?>
<note>
  <to>Tove</to>
  <from>Jani</from>
  <heading>Reminder</heading>
  <body>Don't forget me this weekend!</body>
</note>

also I have my XSD:

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified">
  <xs:element name="note">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="to" type="xs:string"/>
        <xs:element name="from" type="xs:string"/>
        <xs:element name="heading" type="xs:string"/>
        <xs:element name="body" type="xs:int"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

As we can see, the body field I’ve put as int, just to simulate the error.

Well, to try get the error, I have the following code:

//event handler to manage the errors
private static void verifyErrors(object sender, ValidationEventArgs args)
{
    if (args.Severity == XmlSeverityType.Warning)
        MessageBox.Show(args.Message);
}

On click button, I have:

        private void button1_Click(object sender, EventArgs e)
        {

            try
            {
                // my XmlDocument (in this case I will load from hardisk)
                XmlDocument xml = new XmlDocument();
                // load the XSD schema.. is this right?
                xml.Schemas.Add("http://www.w3schools.com", "meuEsquema.xsd");

                // Load my XML from hardisk
                xml.Load("meusDados.xml");

                // event handler to manage the errors from XmlDocument object
                ValidationEventHandler veh = new ValidationEventHandler(verificaErros);

                // try to validate my XML.. and the event handler verifyError will show the error
                xml.Validate(veh);
            }
            catch {
              // do nothing.. just to test
            }
        }

The problem is that I changed the body field to int, but there are a string value in that field and I am not getting error.

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1 Answer

  1. Editorial Team

    The problem is XML namespaces.

    In your XSD, you define the targetNamespace= and xmlns= to both be "http://www.w3schools.com":

    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           targetNamespace="http://www.w3schools.com"
           xmlns="http://www.w3schools.com"
           elementFormDefault="qualified">

    However – your XML document does not contain any XML namespaces.

    <?xml version="1.0"?>
<note>
  <to>Tove</to>
  <from>Jani</from>
  <heading>Reminder</heading>
  <body>Don't forget me this weekend!</body>
</note>

    So basically, that XSD isn’t validating this XML at all.

    You need to either remove those namespaces from your XSD:

    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified">

    or alternatively, add the default XML namespace (with no prefix) defined in your XSD to your XML:

    <?xml version="1.0"?>
<note xmlns="http://www.w3schools.com">
  <to>Tove</to>
  <from>Jani</from>
  <heading>Reminder</heading>
  <body>Don't forget me this weekend!</body>
</note>

    If you have XML namespaces in your XSD, those have to be present in the XML as well – and vice versa.

    Once you do one or the other solution, you should get a validation error something like:

    Validation error: The 'body' element is invalid - The value 'Don't forget me this weekend!' is invalid according to its datatype
'http://www.w3.org/2001/XMLSchema:int' - The string 'Don't forget me this weekend!' is not a valid Int32 value.
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