Extensions to allow introspection of Freemarker template

I work with user-submitted templates, and would like Freemarker support some form of introspection of a template. For example, I might want to know what identifiers the template will request from the model. Freemarker already has something very close to this: the public method Template.getRootTreeNode exposes a DOM-like structure the end user. Unfortunately, the TemplateElement classes that comes back are mostly not visible to the public.

Since I'd rather not fork an internal copy of Freemarker, I'd like to explore the possibility of contributing changes to the Freemarker project to enable template introspection. I want to see if there's an approach that the maintainers will find acceptable.

1) The easiest way to accomplish this is to make the TemplateElement hierarchy public and add public getters to these classes. On the other hand, this might expose more than you'd like. 2) You have implemented similar functionality by having this class implement the TreeNode interface to expose this tree as a Swing component. Perhaps a separate interface hierarchy will provide acceptable decoupling?

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