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On 24.01.2012 20:34, Tony Finch wrote:
A more principled approach is to parse everything as it comes in off the
wire into a tree-structured internal representation. Instead of
interpolating strings into templates you graft tree nodes into slots.
You then serialize the parse tree back into its external representation
when sending it out, and the serializer will naturally either do the right
thing or fail clearly.

+1 (+ the same for the templates itself (interpolation as trees merge operation before serialization))