Missing schema targetNamespace=\"\".

I am trying to serialize an object that implements the IXmlSerializable interface and has the XmlSchemaProvider attribute but I keep getting the an exception thrown with the message "Missing schema targetNamespace=\"\"." when I try and serialize an object that contains my object.

Here's the code I'm using to generate the schema:

public static XmlQualifiedName CreateSchema(XmlSchemaSet xs)

{

XmlSchema schema = new XmlSchema();

schema.Id = "PresentationSchema";

schema.TargetNamespace = " http://www.hide-link.com/ ;;

XmlSchemaComplexType root = new XmlSchemaComplexType();

root.Name = "Presentation";

XmlSchemaSequence rootSeq = new XmlSchemaSequence();

root.Particle = rootSeq;

XmlSchemaComplexType indexElement = new XmlSchemaComplexType();

indexElement.Name = "Indexes";

XmlSchemaElement indexRef = new XmlSchemaElement();

indexRef.RefName = new XmlQualifiedName("Indexes", " http://www.hide-link.com/ ;);

rootSeq.Items.Add(indexRef);

XmlSchemaSequence ids = new XmlSchemaSequence();

ids.MinOccurs = 0;

ids.MaxOccursString = "unbounded";

XmlSchemaElement idRef = new XmlSchemaElement();

idRef.SchemaTypeName = new XmlQualifiedName("integer"," http://www.hide-link.com/ ;);

idRef.Name = "ID";

ids.Items.Add(idRef);

indexElement.Particle = ids;

schema.Items.Add(root);

schema.Items.Add(indexElement);

return new XmlQualifiedName("Presentation");

}

And it produces this schema:

< xml version="1.0" encoding="utf-8" >
<xs:schema targetNamespace=" http://www.hide-link.com/ " id="PresentationSchema" xmlns:xs=" http://www.hide-link.com/ ">
<xs:complexType name="Presentation">
<xs:sequence>
<xs:element ref="xs:Indexes" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="Indexes">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="ID" type="xs:integer" />
</xs:sequence>
</xs:complexType>
</xs:schema>

Can somebody please tell me what is going wrong here These schema are very confusing.

Thanks

.NET Development2

In your CreateSchema() method, you should add the schema of your object to the XmlSchemaSet parameter that is passed in. You are missing the following line in your code:

xs.Add(null, schema);

As a side note, it is not recommended to specify targetNamespace of your custom schema as the W3C schema namespace(http://www.w3.org/2001/XMLSchema) as it means that you are extending the Schema for Schema. You should change your targetNamespace attribute to something like "MyPresentationSchema".

Thanks,

Priya

Thanks for your reply. That seems to have fixed that particular problem. I've changed the code around a bit, but now I'm getting this error:

Schema type information provided by IXmlSerializable is invalid: Type 'IndexType' is not declared.

Here's the code now:

public static XmlQualifiedName CreateSchema(XmlSchemaSet xs)

{

XmlSchema schema = new XmlSchema();

schema.Id = "PresentationSchema";

schema.TargetNamespace = "MyPresentationSchema";

XmlSchemaComplexType root = new XmlSchemaComplexType();

root.Name = "Presentation";

XmlSchemaSequence rootSeq = new XmlSchemaSequence();

root.Particle = rootSeq;

XmlSchemaComplexType indexElement = new XmlSchemaComplexType();

indexElement.Name = "IndexType";

XmlSchemaElement indexRef = new XmlSchemaElement();

indexRef.SchemaTypeName = new XmlQualifiedName("IndexType");

indexRef.Name = "Indexes";

rootSeq.Items.Add(indexRef);

XmlSchemaSequence ids = new XmlSchemaSequence();

ids.MinOccurs = 0;

ids.MaxOccursString = "unbounded";

XmlSchemaElement idRef = new XmlSchemaElement();

idRef.SchemaTypeName = new XmlQualifiedName("integer","http://www.w3.org/2001/XMLSchema");

idRef.Name = "ID";

ids.Items.Add(idRef);

indexElement.Particle = ids;

schema.Items.Add(indexElement);

schema.Items.Add(root);

xs.Add(schema);

return new XmlQualifiedName("Presentation");

}

Which produces this schema:

< xml version="1.0" encoding="utf-8" >
<xs:schema xmlns:tns="MyPresentationSchema" targetNamespace="MyPresentationSchema" id="PresentationSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:complexType name="IndexType">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="ID" type="xs:integer" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="Presentation">
<xs:sequence>
<xs:element name="Indexes" type="IndexType" />
</xs:sequence>
</xs:complexType>
</xs:schema>

Which seems fine to me because it defines 'IndexType'.

Any ideas

Thanks

If the targetNamespace is not the default namespace in your schema, you have to namespace qualify all references to type names, element names etc

indexRef.SchemaTypeName = new XmlQualifiedName("IndexType"); should be

indexRef.SchemaTypeName = new XmlQualifiedName("IndexType", "MyPresentationSchema");

and the above change should change this <xs:element name="Indexes" type="IndexType" /> to

<xs:element name="Indexes" type="tns:IndexType" />

Thanks,

Priya