Unity3D deferred WWW loading

Example.cs

public class Example : MonoBehaviour {

	// Some other state / variables here

	// Load the specified JSON resource as the DataSet
	IEnumerator Load(string url) {
		
		WWW json = new WWW(url);
		
		yield return json;
		
		if (json.error == null) {
			elements = (IList<IDictionary<string, object>>) JsonFx.Json.JsonReader.Deserialize(json.text);
			
			OnLoad(); // WORKS -- this gets called, \o/
		} else {
			Debug.LogError("Failed to download " + url + ": " + json.error);
		}
	}

	IEnumerator LoadMultiple(IEnumerable<string> urls) {
		
		foreach (string url in urls) {
			WWW json = new WWW(url);
			
			yield return json;
			
			if (json.error == null) {
				// append all to the internal list

			} else {
				Debug.LogError("Failed to download " + serviceUrl + symbol);
			}
		}
		
		OnLoad(); // THIS IS NOT CALLED, WHY?
	}

	IEnumerator Start() {
		return Load("http://example.com/resource.json");
	}
}