WSDL for REST adaptor with file attachment in OSB 12C - wsdl

Question

I am using Oracle Service Bus 12C with REST services. I add proxy and business services and select to use WSDL with both.
A typical request WSDL would be:
<?xml version = '1.0' encoding = 'UTF-8'?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:nxsd="http://xmlns.oracle.com/pcbpel/nxsd"
xmlns:tns="http://TargetNamespace.com/LocationServices_getDistricts_request"
targetNamespace="http://TargetNamespace.com/LocationServices_getDistricts_request"
elementFormDefault="qualified" attributeFormDefault="unqualified" nxsd:encoding="US-ASCII">
<xsd:element name="Districts-Proxy-Request-Root-Element">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="db" type="xsd:string" minOccurs="0"/>
<xsd:element name="divisionId" type="xsd:integer" minOccurs="0"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:annotation>
<xsd:appinfo>NXSDSAMPLE=</xsd:appinfo>
<xsd:appinfo>USEHEADER=false</xsd:appinfo>
</xsd:annotation>
</xsd:schema>
And a response would be:
<?xml version = '1.0' encoding = 'UTF-8'?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://TargetNamespace.com/LocationServices_getDistricts_response"
targetNamespace="http://TargetNamespace.com/LocationServices_getDistricts_response"
xmlns:nxsd="http://xmlns.oracle.com/pcbpel/nxsd"
elementFormDefault="qualified"
nxsd:version="JSON" nxsd:encoding="US-ASCII">
<xsd:element name="Districts-Proxy-Response-Root-Element">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="statusCode" type="xsd:integer"/>
<xsd:element name="statusDescription" type="xsd:string"/>
<xsd:element name="data" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="districtId" type="xsd:integer" minOccurs="0"/>
<xsd:element name="districtName" type="xsd:string" minOccurs="0"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:annotation xmlns="">
<xsd:appinfo>NXSDSAMPLE=</xsd:appinfo>
<xsd:appinfo>USEHEADER=false</xsd:appinfo>
</xsd:annotation>
</xsd:schema>
I know how to handle requests and responses with strings and numbers. My question is, what would the WSDL be if the request had a file attachment? What if the response did?
Related to above, I use XQuery transformations to convert proxy requests to business requests and business responses to proxy responses. A typical response transformation file would be:
xquery version "1.0" encoding "utf-8";
(:: OracleAnnotationVersion "1.0" ::)
declare namespace ns1="http://TargetNamespace.com/LocationServices_getDistricts_response";
(:: import schema at "Districts-Response.xsd" ::)
declare variable $statusCode as xs:integer external;
declare variable $statusDescription as xs:string external;
declare variable $data external;
declare function local:func($statusCode as xs:integer, $statusDescription as xs:string, $data) as element()
(:: schema-element(ns1:Districts-Proxy-Response-Root-Element) ::) {
<ns1:Districts-Proxy-Response-Root-Element
xmlns:ns1="http://TargetNamespace.com/LocationServices_getDistricts_response">
<ns1:statusCode>{fn:data($statusCode)}</ns1:statusCode>
<ns1:statusDescription>{fn:data($statusDescription)}</ns1:statusDescription>
{
if ( $data eq "" ) then (
<ns1:data/>
) else (
for $x in $data/ns1:data
return <ns1:data>
<ns1:districtId>{fn:data($x/ns1:DISTRICTID)}</ns1:districtId>
<ns1:districtName>{fn:data($x/ns1:DISTRICTNAME)}</ns1:districtName>
</ns1:data>
)
}
</ns1:Districts-Proxy-Response-Root-Element>
};
local:func($statusCode, $statusDescription, $data)
What would the XQuery code be to handle attachments?