The error message I get when sending a message

Conversion failed when converting the nvarchar value 'A message of type
'SQLServerSourceControlSubversionRequest'
failed XML validation on the target service.
XML Validation: Declaration not found for element
'SubversionMessageRequest'.
Location: /*:SubversionMessageRequest[1]
This occurred in the message with Conversation ID
'4D8953BF-2F94-46A8-8AE3-0DEE68DA1429',
Initiator: 1, and Message sequence number: 0.' to data type int.'

Needless to say my XML is almost not existant. So here is what I have
defined.

CREATE XML SCHEMA COLLECTION dbo.SQLServerSourceControlSchemCollection AS N'
<xsd:schema targetNamespace="urn:schemas-microsoft-com:sql:SqlRowSet1"
xmlns:schema="urn:schemas-microsoft-com:sql:SqlRowSet1"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes"
elementFormDefault="qualified">
 <xsd:import
 namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes"
 schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd"
 />
 <xsd:element name="SubversionMessageRequest">
   <xsd:complexType>
     <xsd:attribute name="EventID" type="sqltypes:int" use="required" />
     <xsd:attribute name="EventType" type="sqltypes:nvarchar"
     use="required">
     </xsd:attribute>
   </xsd:complexType>
 </xsd:element>
</xsd:schema>
<xsd:schema targetNamespace="urn:schemas-microsoft-com:sql:SqlRowSet1"
xmlns:schema="urn:schemas-microsoft-com:sql:SqlRowSet1"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes"
elementFormDefault="qualified">
    <xsd:import
    namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes"
    schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd"
    />
    <xsd:element name="SubversionMessageResponse">
        <xsd:complexType>
            <xsd:attribute name="ResponseID" type="sqltypes:int" use="required" />
        </xsd:complexType>   
    </xsd:element>
</xsd:schema>
'

GO
CREATE MESSAGE TYPE SQLServerSourceControlSubversionRequest
   VALIDATION = VALID_XML WITH SCHEMA COLLECTION
   SQLServerSourceControlSchemCollection;
GO
CREATE MESSAGE TYPE SQLServerSourceControlSubversionResponse
   VALIDATION = VALID_XML WITH SCHEMA COLLECTION
   SQLServerSourceControlSchemCollection;
GO
CREATE CONTRACT SQLServerSourceControlSubversionContract
(    SQLServerSourceControlSubversionRequest    SENT BY INITIATOR
   ,SQLServerSourceControlSubversionResponse    SENT BY TARGET
);
GO

This is the message string constructed

<SubversionMessageRequest><EventID>1</EventID><EventType>http://schemas.microsoft.com/SQL/Notifications/EventNotification</EventType></Su
bversionMessageRequest>

This is what I am using to send the message

                            BEGIN DIALOG CONVERSATION @ConversationHandle
                                    FROM  SERVICE    SQLServerEventLoggingService
                                    TO SERVICE        'SQLServerSourceControlSubversionService'
                                    ON CONTRACT        SQLServerSourceControlSubversionContract
                                    WITH ENCRYPTION = OFF;
                            SEND ON CONVERSATION @ConversationHandle
                                    MESSAGE TYPE SQLServerSourceControlSubversionRequest
                                    (@SubversionMessage);

My guess is that I am not putting enough infomration in the XML for the
broker to find the validation schema in SQL server
but I am not sure what or how  I need to add to the XML.

Thanks
Tom