Length-limited, singular and scalar pieces of data can definitely be held in attributes. It is perfectly fine to have: <country name="Liechtenstein" rank=

Length-limited, singular and scalar pieces of data can definitely be held in attributes. It is perfectly fine to have: <country name="Liechtenstein" rank="1" gdppc="141100"> <neighbor name="Austria" direction="E"/> <neighbor name="Switzerland" direction="W"/> <country>