The Room of Requirement--a plot hole?

[Diana Walter]

No: HPFGUIDX 91005

Chelle:
> I always thought it was a magical holodeck. If it wasn't tangible 
>it wouldn't be able to leave the room.

But then there would be no point in Filch finding cleaning supplies 
there when he runs out, like Dobby says he has done in the past.

After all the discussion that's been done on this subject, I'm more 
inclined to go with the theory that the room summons what you need 
from elsewhere in the castle. In that case, the parchment Umbridge 
found would have to be tangible.

Although now that I think about it, I can't remember...was she aware 
of the Room of Requirement's powers? If not, she never would have 
doubted the parchment's authenticity anyway.
                                                --daw