Grammar-based editor

I was thinking it would be great to have a generic grammar-based editor where you first define the grammar of a file (like an INI file made of [Sections] and key=value, or an XML file, or a C source file), then it opens data in this syntax and offers an editor with an interface to edit (add, modify, remove), fold, or somehow process nodes in a high-level way.

For example, you could define an INI file with [Sections] and key=value, where you always have a Default key and may have other keys, and you would get an editor that will allow you to create/modify/delete sections, each of which must show a Default input box, plus the ability to create/modify/delete sections.

I was wondering if such a tool exists already.

>>1
www.opera.com

>>1
i dont know if one exists but im wanting one

>>1,3 Same person.

there's probably something with sgml and dtd and all that good stuff somewhere

its called the brain

>>1
Linux can do what you want.

>>4
 failed fag

Ok, we've had same person, Opera, Lunix, and fags, oh and we're missing Stop using Internet Explorer and FORMAT so I'm mentioning them here.

Memes spent, do you know of any software like I, >>1, asked for?

>>9
try deleting your registry keys, and such a program will appear

>>9
Start using Internet Explorer.