> I think there are 2 representations that could be useful:

I think there are really two axis: 1) Shape of the data and 2) Language 
being described

You've outlined 2 out of the 3 interesting (to me) shapes: 1) raw data 
structures and 2) datoms. I think that the 3rd interesting one is a 
map/vector tree, like the CLJS analyzer output.

The two languages to describe are EDN and Clojure. You can further break 
Clojure down by host platform, and even potentially further (for example: 
pre and post macro expansion variants of the language).

> 1. as pure EDN data that encodes the various reader macros within the 
strict EDN subset, as a kind of minimal AST

I made a related design page here: 
http://dev.clojure.org/display/design/Representing+EDN

The contents of that design page right now are focused on the raw data 
structures shape of EDN, hence the proposal for a TaggedLiteral type.

Here's some code for parsing raw data with a TaggedLiteral record into a 
vector/map tree of sorts:
https://github.com/brandonbloom/ascribe/blob/04384d21bd9e74e29d84cf2ec1c55dd5034195e0/test/ascribe/cljs/parse.clj

As for the Code variant, the tools.analyzer library and CLJS compilers have 
an internal AST representation that should eventually be standardized. The 
important thing there for me is that we differentiate fundamental 
properties of AST nodes and synthesized/derived attributes that are 
attached to each node.

>

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