XML Disappears in Script Mediator - wso2

Question

I want to add a new child node to an XML request I'm proxying through to WSO2 DSS using an API.
The request I receive is in the following format:
<contacts>
<firstName>Bob</firstName>
<lastName>Brown</lastName>
</contacts>
I need to add an "id" node to this request that I can retrieve from a URI variable.
<contacts>
<id>1</id>
<firstName>Bob</firstName>
<lastName>Brown</firstName>
</contacts>
I've tried using the "enrich" mediator, but this seems to just wrap the ID node around the first name and last name nodes.
So I've resorted to using a script mediator to modify the request. This is what I'd like to do:
//Get XML Request from message context
var request= mc.getPayloadXML();
//Create a child node using standard E4X notation
var child = <id>1</id>;
//Append this XML to the request
request.appendChild(child);
//Replace the payload
mc.setPayloadXML(request);
Every time I try to submit this code, the WSO2 ESB API UI says that everything is cool. But when I check the underlying XML configuration, it is not cool. Where I defined "id" node is now just blank, as if it was filtered without my knowledge!
It would be great if I could add this element using a script mediator, but I'm open to other solutions.

Answer 1

This was actually a pretty easy fix. Just use a CDATA section to have the XML parser ignore your code.
<![CDATA[ //YOUR CODE WITH XML INLINE// ]]>
Note that for some reason the WSO2 ESB XML Editor and UI will remove the CDATA section the next time you open your sequence for editing. I generally just copy out the XML configuration to a text file and paste it back into the configuration whenever it needs to be updated.
Not a perfect solution, but it'll get you over the line.