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From: Lennart Borgman <lennart.borgman.073@student.lu.se>
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Subject: Re: PHP mode in Emacs?
Date: Mon, 01 May 2006 22:22:52 +0200
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Stefan Monnier wrote:
>> Well, major modes have basically two major areas of interest: key maps
>> and syntax highlighting.
>>     
>
> You forget a big one: indentation.
>   
nxml-mode also checks the document against the DTD as you type in your 
text. And I believe that it also does syntax highlighting in a different 
way than other modes. Here is the explanation form nxml-mode.el:

;; The font locking here is independent of font-lock.el.  We want to
;; do more sophisticated handling of changes and we want to use the
;; same xmltok rather than regexps for parsing so that we parse
;; consistently and correctly.