Hi.

Using VB.Net System.Xml 1.0
SchemaCollection Object

I am getting an error when trying to add
‘Schema A’ to the SchemaCollection.

Here are my schema files..

Schema A
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="http://www.twiststandards.org/3.0/ElectronicBilling"
          xmlns:xs="http://www.w3.org/2001/XMLSchema"
          targetNamespace="http://www.twiststandards.org/3.0/ElectronicBilling"
          elementFormDefault="qualified"
          attributeFormDefault="unqualified">
   
    <xs:include schemaLocation="TestTwistMsg.xsd"/>

   <xs:complexType name="ElectronicBillingMsg">
        <xs:complexContent>
            <xs:extension base="MessageHeader">
                <xs:sequence>
                    <xs:element name="serviceAdjustment" type="ServiceAdjustment"
maxOccurs="unbounded"/>
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>   

    <xs:complexType name="ServiceAdjustment">
        <xs:sequence>
            <xs:element name="volumeChange" type="xs:decimal" minOccurs="0">
            </xs:element>
            <xs:element name="originalVolume" type="xs:decimal" minOccurs="0">
            </xs:element>
            <xs:element name="newVolume" type="xs:decimal" minOccurs="0">
            </xs:element>
        </xs:sequence>
    </xs:complexType>

</xs:schema>

Schema B

<?xml version="1.0" encoding="UTF-8"?>

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

    <xs:complexType name="MessageHeader">
        <xs:annotation>
            <xs:documentation xml:lang="en">A type defining the content model for a
generic message header that is refined by its derived
classes.</xs:documentation>
        </xs:annotation>
        <xs:sequence>
            <xs:element name="messageType" type="xs:string" minOccurs="0">
            </xs:element>
            <xs:element name="creationTimestamp" type="xs:dateTime">
            </xs:element>
        </xs:sequence>
    </xs:complexType>
   
    <xs:complexType name="NotificationMessageHeader">
        <xs:annotation>
            <xs:documentation xml:lang="en">A type that refines the generic message
header to match the requirements of a NotificationMessage.</xs:documentation>
        </xs:annotation>
        <xs:complexContent>
            <xs:restriction base="MessageHeader">
                <xs:sequence>
                    <xs:element name="messageType" type="xs:string" minOccurs="0">
                    </xs:element>
                    <xs:element name="creationTimestamp" type="xs:dateTime">
                    </xs:element>
                </xs:sequence>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>

</xs:schema>

Schema A ‘Includes’ Schema B.

The error is..
Undefined complexType 'MessageHeader' is used as a base for complex type
restriction

I can validate this schema in Stylus that is using Xerces Validation Parcer.
What can I do to skip/fix this error?

Thank You.