tags <pagelist > accepted parameters of the form 1to10=roman to specify attribute value applying to a range of page, some change in attribute name sanitizing break this feature, see #17031. While 17031 state it increase the possible attribute names, it also decrease them in some case. As extension tag are not valid xml anyway, I don't see why we would apply such restriction to extension attribute name.
Version: unspecified
Severity: enhancement
URL: http://fr.wikisource.org/w/index.php?title=Livre:M%C3%A9moires_de_la_soci%C3%A9t%C3%A9_g%C3%A9ologique_de_France_-_Tome_1_-_1833-1834.djvu