SSRS passing parameters to a web service call

SSRS passing parameters to a web service call

I'm calling a function on an XML web service, and that service requires a
boolean value. But I am at a loss as to how to send a value. It looks like
I'll need a parameter, but it's not having any effect. I've got a
parameter that needs to be put into the report, calling it Boolean at the
moment for simplicity.
<Parameters>
<Parameter Name="Boolean"/>
</Parameters>
This isn't having any effect on the result, it's always being treated as a
function with the default value of false.