At [this German Wikipedia discussion](http://de.wikipedia.org/wiki/Hilfe_Diskussion:TeX#Kommutative-Diagramme_.2F_XY-Packet), I started a thread where several people have agreed with the suggestion.
I proposed that the *XY* package be loaded in the LaTeX preamble used by Wikipedia. Information about this LaTeX package and how to load it can be found [here](http://www.guntherkrauss.de/computer/tex/diagramme.html).
This package allows users to create commutative diagrams directly in Wikitext, eliminating the need to generate and upload separate image files. It would save editors time and make it easier for others to modify or adjust existing diagrams.
Examples of diagrams borrowed from https://www.guntherkrauss.de/computer/tex/diagramme.html :
{F71782563} {F71782559}
(these are basic shapes and therefore ineligible for copyright)