XSLT - How to create (or update) a variable and use it in another policy

[#1]

Hello,

My XSLT does some transformations and assigns values to a couple of variables. The next step is a service callout. Now, I don't want to make the service call if the value of those two variables are of certain values? How can I accomplish that?

I have to either create a variable in XSL and use it on my next step or update a context variable inside my XSLT so I can use it in subsequent steps.

Thanks in advance.