supplemental
fun supplemental(content: String?, attr: Map<QName, String?> = emptyMap()): XvrlSupplemental(source)
fun supplemental(content: XdmNode, attr: Map<QName, String?> = emptyMap()): XvrlSupplemental(source)
fun supplemental(content: List<XdmNode>, attr: Map<QName, String?> = emptyMap()): XvrlSupplemental(source)