Excerpts from Steven Platt's message of 2011-10-19 09:18:27 +0000:
> Posted the following a week ago, but no responses... any thoughts
> anyone?

I'm pretty sure that no parameter substitution is performed on the value
fields. `userEmail` in particular is only defined when building command
lines / config files.

This could be implemented however. You would need to update the context
used by Tool.update_state to be able to lookup these special variables,
and perform substitution on values -- probably only the first time you
get_initial_value for a ToolParameter. 
-- 
James Taylor, Assistant Professor, Biology / Computer Science, Emory University
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