XSLT is used to transform XML payloads between different forms. In Mule, the XSLT transformer component allows transforming XML payloads using XSLT stylesheets. For example, a flow uses an HTTP inbound endpoint, sets an XML payload, and applies an XSLT stylesheet using the XSLT transformer to output a new transformed XML payload. The XSLT stylesheet matches elements in the input XML and outputs a new structure defined in the stylesheet.

1. Using XSLT in Mule (For beginner )

2. We often use XSLT in our application to transform XML
payload from one form to another . Mule also supports XSLT
in it’s application with XSLT-Transformer component.

3. So, How can we use XSLT in Mule application??
.

4. Here I will show you how ……

5. Before we start we must see what an XSLT actually is :-
As per XSLT definition :-
XSLT (Extensible Stylesheet Language Transformations) is a language
for transforming XML documents into other XML documents, or other
formats such as HTML for web pages, plain text or into XSL Formatting
Objects, which may subsequently be converted to other formats, such
as PDF PostScript and PNG.
Source :- http://en.wikipedia.org/wiki/XSLT

6. So, XSLT can be use to transform one form of XML to another :-
Here you can see the XSLT is transforming the XML payload into another XML

7. So, let us try this example in our Mule application
Here we will be using XSLT for transforming the XML payload into another XML
like below :-

8. So let’s consider we have a following flow in our Mule application:-
As you can see we have used a Http inbound end point followed by a set payload
component and then XSLT transformer.
Here the set payload contain the XML that need to be transform

9. So set payload component contains the following payload :-

10. Our corresponding Mule flow will be as follows :-
<flow name="xsltFlow1" doc:name="xsltFlow1">
<http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081"
path="test" doc:name="HTTP"/>
<set-payload
value="&lt;RootElement&gt;&lt;Name&gt;Anirban&lt;/Name&gt;&lt;Department&gt;ATS&lt;/D
epartment&gt;&lt;Designation&gt;SSE&lt;/Designation&gt;&lt;/RootElement&gt;"
doc:name="Set Payload"/>
<mulexml:xslt-transformer
maxIdleTransformers="2" maxActiveTransformers="5" outputEncoding="UTF-8"
doc:name="Transform from outer to inner" xsl-file="Transform.xslt"
encoding="UTF-8" returnClass="java.lang.String" />
</flow>
As you can see we are using XSLT file :- Transform.xslt

11. So, the file Transform.xslt
should be in our src/main/resource folder

12. The file Transform.xslt
Contains following code to transform :-
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes" />
<xsl:template match="/">
<NewRootElement>
<NewName>
<xsl:value-of select="RootElement/Name" />
</NewName>
<NewDepartment>
<xsl:value-of select="RootElement/Department" />
</NewDepartment>
<NewDesignation>
<xsl:value-of select="RootElement/Designation" />
</NewDesignation>
</NewRootElement>
</xsl:template>
</xsl:stylesheet>

13. To test the application we hit the url http://localhost:8081/test in our
browser and we get the following :-
And you can see the XML payload has been transferred to this new XML

14. Hope you enjoyed the simple yet an amazing trick in Mule