ExtractValue and UpdateValue are case sensitive. So working with XML tags is a headache

ExtractValue and UpdateValue are case sensitive. So for looking for a certaing Tag in the correct case can be a difficult task.

readin MySQL 5.5 and above Manuals,
https://dev.mysql.com/doc/refman/5.7/en/xml-functions.html

They say that:
(Previously, binary—that is, case-sensitive—comparison was always used.)

So how to make those functions to work case insensitive

Also we should improve These function's documentation for how o use those functions