only permit <emph> and <ref> as element children of <unitid>
only permit <emph> and <ref> as element children of <unitid>

SAA-SDT/EAD3,informaticmonad/EAD3,SAA-SDT/EAD-Revision,SAA-SDT/EAD3,SAA-SDT/EAD-Revision,informaticmonad/EAD3