JATS-0012-001
<sup/> element cannot contain <sub/> element
JATS-0012-002
<sub/> element cannot contain <sup/> element
JATS-0012-003
list
@list-type must have one of the following values: "unorder", "bullet", "order", "simple",
"alpha-lower", "alpha-upper", "roman-upper", "roman-lower", "none"