method = "xml" | "html" | "text" | expanded name.
The value of the method property identifies the overall method that should be used for outputting the result tree. Other non-namespaced values may be used, such as "xhtml", but, if accepted, the handling of such values is implementation defined. If any of the method values are not accepted and are not namespace qualified, then Transformer.SetOutputProperty(string, System.String) or Transformer.OutputProperties will throw a Java.Lang.IllegalArgumentException.