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# List of issues
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* Currently I am rebuilding the MathML tree, by cloning (most of) the original node. Is that what we want?
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* Exceptions to cloning are empty/meaningless layout elements. The are kept and the originals are retained.
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* We make deep clones of leaf nodes.
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* We make shallow clones of all other nodes.
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* What do we do with empty elements. Examples are [[implicit multiplication]], [[function application]].
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* Current solution: Turn them into explicit elements. E.g., mo with invisible times.
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* Usually the MathML does not change significantly. There are exceptions, though.
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* [[Mmultiscripts example]]
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* The [[msubsup issue]].
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