enumeration :: XParser Enumeration
enumeration =
    bracket (tok TokBraOpen) (commit $ blank $ tok TokBraClose)
            (peRef nmtoken `sepBy1` blank (peRef (tok TokPipe)))
enumeration :: XParser Enumeration
enumeration =
    bracket (tok TokBraOpen) (commit $ blank $ tok TokBraClose)
            (peRef nmtoken `sepBy1` blank (peRef (tok TokPipe)))
enumeration =
    bracket (tok TokBraOpen) (commit $ blank $ tok TokBraClose)
            (peRef nmtoken `sepBy1` blank (peRef (tok TokPipe)))