[Building Sakai] LTI substitute variables

[Alexander Bell]

Hey, I've been looking at LTI Tools in Sakai (specifically by adding a 
tool to IMSBLTIPortlet.xml) and have been trying to get substitute 
variables / dynamic variables to be included in the list of Custom 
Launch Parameters
e.g. startdate=$now();maxpoints=$LineItem.resultValue.max

The problem is I'm uncertain how to add this sort of data without it 
being sent 'as is' and not converted into actual data. So instead of:

> context_title=Test 1
> context_type=CourseSection
> ...
> custom_maxpoints=$LineItem.resultValue.max

you'd get something like

> context_title=Test 1
> context_type=CourseSection
> ...
> custom_maxpoints=88

cheers

Alex
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