Returns an NSXMLElement object created from a specified string containing XML markup.
Original signature is '- (id)initWithXMLString:(NSString *)string error:(NSError **)error'
Available in Mac OS X v10.4 and later.

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The initialized NSXMLElement object or nil if initialization did not succeed.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)