Using XML::XSH2:
open 903926.xml ;
map :i {s/(.*)/[$1]/} //mml:mi[text()!="s"] ; # wrap non-s in square b
+rackets
map "..."  //mml:mi[text()="s"] ;             # replace s with ...

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In reply to Re: Replace MathML content using Twig by choroba
in thread Replace MathML content using Twig by renovatio

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