impl dtd models impl dtd XMLContentSpec cmuniop cmnode cmuniop type cmnode childnode type type xmlcontentspec.contentspecnode_zero_or_one type xmlcontentspec.contentspecnode_zero_or_more type xmlcontentspec.contentspecnode_one_or_more fchild childnode cmnode getchild fchild isnullable type xmlcontentspec.contentspecnode_one_or_more fchild.isnullable calcfirstpos cmstateset toset.setto fchild.firstpos calclastpos cmstateset toset.setto fchild.lastpos cmnode fchild