The current Mime-Resolver grammar does not support ignorecase on file extension. This makes no sense, since it supports ignorecase on the full file name, as well as on patterns/text in the file. 

This results in users having to add six separate entries in order to have a case insensitive (3 letter) file extension. i.e. *.txt, *.TXT, *.Txt, ....

i.e. It should support 
<file>
   <ext name="txt" ignorecase="true"/>
   <resolver mime="text/txt"/>
</file>


I propose adding support for a 'ignorecase' attribute on the 'ext' file mime type, while leaving the default behaviour as case sensitive if ignorecase attribute is not defined.

Most applications treat file extensions as case insensitive (*.txt vs *.TXT or *.PNG vs *.png....) so I find it hard to understand why all other attributes in the xml document support case-insensitive attribute, while file extension does not.