How to use event variables/instance variables in JS code where clause

Hi Everyone,

I am trying to write a queryDef code where in I want to filter the records based on the internalName of the previously executed delivery dynamically. Something like below-

var query=xtk.queryDef.create(

<queryDef schema="nms:delivery" operation="select"/>

<select>

<node expr="@id"/>

</select>

<where>

<condition expr="@internalName='DM123456' "/>

</where>

</queryDef>.ExecuteQuery();

In the above code the "DM123456" i want it to dynamic to an instance/event variable which i can create before.

Can someone please help, it will be great if it's possible.

Whatever solutions can be provided is highly appreciated.

Thanks,

Akash