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Using xsd.exe to generate C# classes, how to specify an existing type?

I have an XML Schema file (XSD) which I'm using to generate C# classes using the xsd tool supplied with Visual Studio.

If it's possible, how do I specify an existing type as the type of an element? Say I want to do this

<xs:element name="Table">
    <xs:complexType>
        <xs:all>
            <!-- ...snip... -->
            <xs:element name="CellValues" type="ADODB.RecordSet"/>
        </xs:all>
    </xs:complexType>
</xs:element>

How do I tell xsd that ADODB.RecordSet is an existing type in an imported assembly?

Perhaps this would help?

(from http://msdn.microsoft.com/en-us/library/x6c1kb0s(v=vs.71).aspx )

/t[ype]:typename

Specifies the name of the type to create a schema for. You can specify multiple type arguments. If typename does not specify a namespace, Xsd.exe matches all types in the assembly with the specified type. If typename specifies a namespace, only that type is matched. If typename ends with an asterisk character (*), the tool matches all types that start with the string preceding the *. If you omit the /type option, Xsd.exe generates schemas for all types in the assembly.

I'm not sure if this is the best way, but I managed to do something by implementing SchemaImporterExtension :

namespace SchemaImport
{
    public class ADODBSchemaImporterExtension : SchemaImporterExtension
    {

        public override CodeExpression ImportDefaultValue(string value, string type)
        {
            return new CodeTypeReferenceExpression(type);
        }

        public override string ImportSchemaType(XmlSchemaType type,
            XmlSchemaObject context, XmlSchemas schemas, XmlSchemaImporter importer,
            CodeCompileUnit compileUnit, CodeNamespace codeNamespace,
            CodeGenerationOptions options, CodeDomProvider codeGenerator)
        {
        return null;
        }

        public override string ImportSchemaType(string name, 
            string ns, XmlSchemaObject context, XmlSchemas schemas, XmlSchemaImporter importer, 
            CodeCompileUnit compileUnit, CodeNamespace mainNamespace, 
            CodeGenerationOptions options, CodeDomProvider codeProvider)
        {
            if (name.StartsWith("ADODB."))
            {
                compileUnit.ReferencedAssemblies.Add("adodb.dll");
                mainNamespace.Imports.Add(new CodeNamespaceImport("ADODB"));
                return name.Substring(name.IndexOf(".") + 1);
            }
            return null;
        }
    }
}

together with defining the ADODB.Recordset as an xsd:complexType :

<xs:element name="Table">
    <xs:complexType>
        <xs:all>
            <!-- ...snip... -->
            <xs:element name="CellValues" type="ADODB.RecordSet"/>
        </xs:all>
    </xs:complexType>
</xs:element>
<xs:complexType name="ADODB.Recordset"/>

I then had to add this class to machine.config :

<system.xml.serialization>
    <schemaImporterExtensions> 
        <add type="SchemaImport.ADODBSchemaImporterExtension, SchemaImport, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cd583032ee337c41" /> 
    </schemaImporterExtensions>
</system.xml.serialization>

and specify the assembly in a parameter file (the /p:parameters.xml switch) to xsd.exe:

<?xml version="1.0" encoding="UTF-8"?>
<xsd xmlns='http://microsoft.com/dotnet/tools/xsd/'>
    <generateClasses language='c#' namespace='TableDocument'>
        <schemaImporterExtensions>
            <type>SchemaImport.ADODBSchemaImporterExtension, SchemaImport, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cd583032ee337c41</type>
        </schemaImporterExtensions>
    </generateClasses>
</xsd>

I ended up with a .cs file with the appropriate Table class, in the TableDocument namespace that had the ADODB as a reference and using statement.

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