Recipe: Converting XML into Trees

While many web services have moved to the simpler JSON format, XML is still a popular and powerful document encoding. iOS’s NSXMLParser class scans through XML, creating callbacks as new elements are processed and finished (that is, using the typical logic of a SAX parser). This class is terrific for when you’re downloading simple data feeds and want to scrape just a bit or two of relevant information. It might not be so great when you’re doing production-type work that relies on error checking, status information, and back-and-forth handshaking.

Recipe 13-6 retrieves the same weather forecast data from as Recipe 13-5 but in XML format. It requests the xml mode rather than the json ...

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