Link XSD-File in WADL - rest

Question

I would like to create a WADL-File from which Java Interfaces can be created using Apache CXF wadl2java Maven plugin.
In the WADL I would like to use the Datatypes defined in a XSD-File.
These are my REST Services:
#Path("/v1/order")
public interface OrderResource {
#PUT
#Consumes(MediaType.APPLICATION_XML)
public Response createOrder(Order order);
#GET
#Produces(MediaType.APPLICATION_XML)
public List<Order> getOrders(#QueryParam("orderId") List<Long> orderIds);
}
My WADL:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<application xmlns="http://wadl.dev.java.net/2009/02" >
<grammars>
<include href="RestService_schema1.xsd" />
</grammars>
<resources base="http://localhost:9080/rest/">
<resource path="v1/order/" id="OrderResource">
<resource>
<method name="PUT" id="createOrder">
<request>
<representation mediaType="application/xml" />
</request>
<response status="200">
</response>
</method>
</resource>
</resource>
<resource>
<method name="GET" id="getOrders">
<request>
<param name="orderId" style="query" type="xs:long" />
</request>
<response status="200">
<representation mediaType="application/xml" />
</response>
</method>
</resource>
</resources>
</application>
My RestService_schema1.xsd:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="Order" type="Order" />
<xs:complexType name="Order">
<xs:attribute name="OrderId" type="orderid">
<xs:annotation>
<xs:documentation>...
</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:sequence>
.
.
.
.
</xs:sequence>
</xs:complexType>
<xs:simpleType name="orderid">
<xs:annotation>
<xs:documentation> ....
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:long" />
</xs:simpleType>
</xs:schema>
What I want to do:
I would like to specify in my WADL the input type Order for the createOrder Service. I know this can be done with the element-attribute, but how can I link it? Maybe element="Order" within the <representation>-Tag??
The Query Param of the getOrders()-Service should be List<Long> (in the WADL a List with orderid's) and the Response Type List<Order>. How can I specify this in the WADL?