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Extension XML

Many feeds may also contain extension XML elements. If additional namespaces are used in a feed, use the extensionXMLElementsUsingNamespace: method to return an array of NSXMLElement objects. Pass the namespace URL, not the prefix, to the extensionXMLElementsUsingNamespace: method. If your feed had an entry like that in Listing 1-3, extensionXMLElementsUsingNamespace: returns an array of four NSXMLElement objects.

Listing 4-5 shows how to find a specific element in a particular namespace in an entry. In this example, the namespace is the iTunes Podcast.

Listing 4-5  Retrieving extension XML from an entry

// Find each element using the iTunes Podcast namespace

for( NSXMLElement *elem in [entry extensionXMLElementsUsingNamespace: @"http://www.itunes.com/dtds/podcast-1.0.dtd"] ) {

    // Check if the element is called "keywords"

    if (NSOrderedSame == [[elem localName] isEqualToString:@"keywords"]) {

        // If it is, print the data from the element to the log

        NSLog(@"keywords:%@", [elem stringValue]);

    }

}

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