Creating an array of XML element in BPEL

The objective of this post is to generate an XML response which has array of XML element using BPEL.

Problem Statement:

Input to the BPEL process : n / integer
Output from BPEL process : result / String array of length n

Solution:

To solve this problem, we can use <bpelx:append>  which is an BPEL extension function

namespace for bplex is xmlns:bpelx="http://schemas.oracle.com/bpel/extension"

Below is the code snippet where it inserts a node using bpelx:append

<bpel:assign name="InsertResponse">
  <bpelx:append>
    <bpelx:from>
        <result xmlns="http://xmlns.oracle.com/HelloWorlsApp/ArrayOutput/Collection">StringTest
        </result>
    </bpelx:from>
    <bpelx:to bpelx:language="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath1.0" variable="outputVariable" part="payload" query="/client:processResponse"/>
   </bpelx:append>      
 </bpel:assign>

This assignment we can keep it inside a <bpel:while> with a condition like index should be less than the input n.


Sample Input

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Body>
     <ns1:process xmlns:ns1="http://xmlns.oracle.com/HelloWorlsApp/ArrayOutput/Collection">
      <ns1:input>3</ns1:input>
       </ns1:process>
    </soap:Body>
</soap:Envelope>

Sample Output

<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsa="http://www.w3.org/2005/08/addressing">
  <env:Body>
<processResponse xmlns="http://xmlns.oracle.com/HelloWorlsApp/ArrayOutput/Collection">
<result>StringTest</result>
<result>StringTest</result>
<result>StringTest</result>
</processResponse>
  </env:Body>
</env:Envelope>

elementFormDefault attribute in XSD Schema definition

This attribute (elementFormDefault) is useful when we are defining our own <complexType> in our schema and the main purpose is to decide whether the <element> inside <complexType> should be in targetNamespace or global namespace

Example:

Sample XSD:

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

<xsd:schema xmlns:ns0="http://ticket.com/ns" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://ticket.com/ns">  

   <xsd:complexType name="routeTicket">

      <xsd:sequence>

         <xsd:element name="ticket" type="xsd:string" minOccurs="0"/>

      </xsd:sequence>

   </xsd:complexType>

   <xsd:complexType name="routeTicketResponse">

      <xsd:sequence>

         <xsd:element name="return" type="xsd:string" minOccurs="0"/>

      </xsd:sequence>

   </xsd:complexType>

   <xsd:element name="routeTicket" type="ns0:routeTicket"/>

   <xsd:element name="routeTicketResponse" type="ns0:routeTicketResponse"/>

</xsd:schema>

when elementFormDefault="unqualified"	when elementFormDefault="qualified"
Valid XML for the given XSD: <?xml version="1.0" encoding="utf-8"?> <xs:routeTicket xmlns:xs="http://ticket.com/ns">   <ticket>str1234</ticket> </xs:routeTicket>	Valid XML for the given XSD: <?xml version="1.0" encoding="utf-8"?> <xs:routeTicket xmlns:xs="http://ticket.com/ns">   <xs:ticket>str1234</xs:ticket> </xs:routeTicket>
XPATH to access ticket /xs:routeTicket/ticket	XPATH to access ticket /xs:routeTicket/xs:ticket

Useful online tools

http://xsd2xml.com/

http://www.freeformatter.com/xml-validator-xsd.html

http://www.freeformatter.com/xpath-tester.html