XSLT copy elements from second XML if not exist in the first XML
问题 I have the following XMLs: car.xml: <car ref-id="parts.xml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <color>red</color> <tire>michelin</tire> <engines> <engine> <model>Z</model> </engine> </engines> <hifi>pioneer</hifi> </car> parts.xml: <?xml version="1.0" encoding="UTF-8"?> <parts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <engines> <engine> <model>X</model> </engine> <engine> <model>Y</model> </engine> </engines> <tire>goodyear</tire> <color>black</color> <airbag