[xsl] Query regarding validating XML with DTD

Subject: [xsl] Query regarding validating XML with DTD
From: "Deepak Angeswar" <dangeswar@xxxxxxxxxxxxx>
Date: Thu, 27 Sep 2007 10:48:53 +0100
My application connects with a mobile-service-provider's server and receives
XML via HTTP POST. I extract the data from XML and send an appropriate
back to the server.
I have been given a set of DTDs by the mobile-service-provider.
The XML I receive/send via HTTP Post must adhere to these DTDs.
My question is - is it necessary to validate the XML I receive from
mobile-service-provider against the DTDs? Or can I assume that - since
the XML was created by the same source who created the DTD; the XML
would definitely adhere to the required rules set in the DTD?
The reason is - I would be receiving loads and loads of such XML
thro HTTP POST; if I am going to validate each such POST request against
DTDs; it might be a huge performance issue!

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