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- separate conformance for AQL lan extensions
- distinguish patient v population querying
- GDL - relationship with AQL - e.g. apply GDL over AQL results.
Problems
Cartesian problem / permutation explosion - need semantics defined (refer to Seref Arikan analysis)
Related: Ian - want to be able to say things like '40 kg' rather than 2 paths.
Link / Reference-following
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