mw-parser.simplify
Simplify a parse tree.
simplify-rule
(simplify-rule tree)
Simplify/canonicalise this tree
. Opportunistically replace complex fragments with semantically identical simpler fragments
simplify-second-of-two
(simplify-second-of-two tree)
There are a number of possible simplifications such that if the tree
has only two elements, the second is semantically sufficient.