XML Editor Intellisense

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C#

hi to all,
I am creating a XML Editor. In this Editor I want to Achieve the intellisense Concept as the other editors are having.

The Detailed Description is as follow:
I am having a rich textbox whenever user type something the intellisense must be appear.
like this :

whenever XML Element starts like.. <student
and user="" press="" the="" space="" corresponding="" attribute="" must="" be="" display="" if="" node="" having="" .="" and="" not="" then="" nothing="" has="" to="" display.="" when="" close="" element="" childnodes="" or="" value="" display...........="" means="" on="" basis="" of="" typed="" text="" i="" have="" generate="" list.

<u="">My Issue:
To know Which element is having attribute and what are they and all information about that element. I am thinking about to take support of External DTD.

But I am not Having any Idea about it that how I can do this.... Like Reading DTD information and all........

Please if Any body is having any idea about it ; reply as early as possible.

If my requirement is not clear ; please let me know.....


Regards,
Adarsh