How to handle a return statement from a login webservice call

Hi all,
I am new to this iPhone apps. I am trying to wirte a webservice call in which I am comparing my username and password details in webservice and getting an boolean statement as a response. By using that response i should display valid or invalid statement on the screen.
Now i am able to get the response from the webservice, but i am unable to handle that boolean variable present in the xml statement.
Can any one please suggest me how to handle that boolean value from the xml statement?
Thanks
SRI.

Since you are a registered developer you would be far better off posting this in the developers site, this forum is for users of apps.

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