can not find a declaration for NSXMLElement while working with xmpp framework in iphone sdk -

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I am trying to develop the chatting application on the iPhone. For this, I have used the XMPP framework, but when I am trying to integrate it with the encoded project, so I'm getting an error like "I can not find the interface announcement for NSXMLElement" when I see the NSXML document it is a class of Mac OS SDK, not IPhone So how do I solve this problem ???

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