This document discusses using XSLT to transform XML payloads in Mule applications. It provides an example of transforming an input XML payload containing name and id elements into an output XML payload that adds a designation element. The Mule flow uses an XSLT transformer to apply an XSL stylesheet to the input XML and output the transformed XML. Testing the flow by deploying the application and sending a request demonstrates how XSLT can easily modify XML payloads in Mule.

1. XML to XML transformation in Mule
Feroz Khan

2. As we know, there can be multiple types of payload we need to deal
daily, starting from JSON, XML or String, we also require different
type of data transformation in our application like XML to JSON,
JSON to XML or String etc . In Mule application, we have a various
set of transformers that we can use to obtain our required data
format.
Here we will be discussing on transformation of XML to XML format
of data. If you have gone through my previous slides on JSON to
JSON transformation here , you will realize how easy it is to perform
such type of transformation in Mule. Here we will take the same
example, but will be doing it on XML instead of JSON this time.

3. So, let us consider, we have the following XML payload as an input
to our application :-
<RootTag>
<name>Anirban Sen Chowdhary</name>
<id>37</id>
</RootTag>
.

4. We can see here the XML contains only 2 elements, that is name
and id.
So, now if this XML data is coming as an input and we require to
transform/modify the payload into anotherXML format and produce
it as an output, something like the following :-
<RootTag>
<name>Anirban Sen Chowdhary</name>
<id>37</id>
<designation>Director</designation>
</RootTag>

5. And here you can see the modified XML has a new element
designation as a third element . Now, the challenge here is to modify
the existing input XML payload and to design an output XML
payload from it, which will contain this additional element in it with
the same format.
So, how can we transform/modify the payload into another XML
format in an easy way. We know Mule has extremely powerful tools
called Datamapper but that limited to Mule enterprise edition.

6. How to transformor modifya XMLpayloadin
Mule ??

7. Asimple way of doing it is using XSLT in Mule. Mule do have XSLT
support in it’s flow, which makes the life of a developer easy in
transforming/modifying XML in the required format.
So, here is the Mule flow which can be use to transform XML payload
from one format to another using XSLT :-

8. After that, we are setting the designation variable with a value, which will
be passed into our XSLT, and it will be adding it there as a node called
designation. So, the XML output coming after XSLT will be the
modified/transformed XML containing additional node called designation.
The XSL file here named as Transform.xsl should be kept under
src/main/resources folder and the xsl file will be as following :-

9. The graphical representation of this flow will be as follows :-

10. Testing our application……

11. Now, we are done with our coding and will deploy our application and test it.
Once deployed on Mule server, we can test our application using RestClient
or any other client you wish.

12. once we click the send button we will get the following response in our client
from our Mule flow :-

13. Conclusion

14. So, you can find transforming or modifying aXMLpayload into another XML
format is extremely easy in Mule using theXSLT.
And that means you can design your outputXMLpayload in any format you
require using XSLT easily in your Mule flow and Mule also support this by
it’s XSLT transformer !!!
That’s all !!! I’ve hopefully been clear enough in displaying the
implementation of XSLT and XSLT transformer in designing and modifying
your XMLpayload which you can produce as an output from your Mule
application.
I hope you liked this !!!

15. Hope you enjoyed the simple yet an amazing trick in Mule
You can also find this post here :- http://bushorn.com/xml-to-xml-
transformation-in-mule/