THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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This syntax is similar to OGNL, XPath, and (I think) the JSP expression language.
One thing to consider with this is that we'll need to define some sort of key method for the expression evaluator to use for index lookup, or some way of uniformly accessing list elements using a mapping of id->value. This may depend on the (currently absent) ability of modello to track the identity elements of a class.