XML Validation error: The element is not declared

Question

I am building a web service in .NET that will pass data back and forth via XML. I would like to validate the XML in the incoming requests using an XSD that I have defined.

Here is the XSD:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:complexType name="POSearch">
       <xs:sequence minOccurs="0" maxOccurs="10">
           <xs:element name="POID" type="xs:positiveInteger"/>
       </xs:sequence>
   </xs:complexType>
</xs:schema>

Here is the XML:

<POSearch>
   <POID>1</POID>
   <POID>2</POID>
</POSearch>

Here is the validation code in C#:

static void Main(string[] args){
   XmlSchemaSet iSchemas = new XmlSchemaSet();
   iSchemas.Add(string.Empty, @"...xsd file location");

   XmlReaderSettings settings = new XmlReaderSettings();
   settings.ValidationType = ValidationType.Schema;
   settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessInlineSchema;
   settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessSchemaLocation;
   settings.ValidationFlags |= XmlSchemaValidationFlags.ReportValidationWarnings;
   settings.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);
   settings.Schemas.Add(iSchemas);

   XmlReader reader = XmlReader.Create(@"...xml file location", settings);

   try {
      while(reader.Read())
       ;
   }
   catch(Exception ex) {
      Console.WriteLine(ex.Message);
   }
}

private static void ValidationCallBack(object sender, ValidationEventArgs args) {
     if(args.Severity == XmlSeverityType.Warning)
        Console.WriteLine("\tWarning: Matching schema not found.  No validation occurred." + args.Message);
     else
        Console.WriteLine("\tValidation error: " + args.Message);
  }

I feel like I had this working before and I'm not completely sure why this isn't working now. Whenever I run this I get the following Exception Message:

Validation error: The 'POSearch' element is not declared.

Have I defined my XSD wrong? Is my validation code wrong? The elements are all clearly there. Any help pointing me in the right direction is greatly appreciated.

Multicolored

This is the only working solution I found in StackOverflow out of 10 about: "Validation error: The 'x' element is not declared." problem. – Swap

Answer 1

You have the type declared but no element declared of that type.

Add an element declaration:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

   <xs:element name="POSearch" type="POSearch"/>

   <xs:complexType name="POSearch">
       <xs:sequence minOccurs="0" maxOccurs="10">
           <xs:element name="POID" type="xs:positiveInteger"/>
       </xs:sequence>
   </xs:complexType>
</xs:schema>

Allochthonous

Answer 2

Try this:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:complexType name="POSearch">
       <xs:sequence minOccurs="0" maxOccurs="10">
           <xs:element name="POID" type="xs:positiveInteger"/>
       </xs:sequence>
   </xs:complexType>
    <xs:element name="POSearch" type="POSearch"/>
</xs:schema>

Courante