ReadXmlSchema Error

[Justin]

Greetings All,

I'm trying to use the ReadXmlSchema method to define a DataSet before using
the ReadXml method, and am receiving the following error:

Type 'http://www.jd.com/commonReq/1.0:OrderInfo' is not declared.

There are 3 schema documents that make up the entire xml schema.
Order.xsd
CommonReq.xsd
Common.xsd

here is the base schema document:

<xsd:schema targetNamespace="http://www.jd.com/order/1.0"
elementFormDefault="qualified" xmlns="http://www.jd.com/order/1.0"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:commonReq="http://www.jd.com/commonReq/1.0">
<xsd:complexType name="OrderInfoNotification">
<xsd:sequence>
<xsd:element name="order" type="commonReq:OrderInfo" form="unqualified">
<xsd:annotation>
<xsd:documentation>
An order.
</xsd:documentation>
</xsd:annotation>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>

Why am I receiving this error, and more importantly, how do I resolve it?

Thanks in advance,
Justin