================================================================================
label
================================================================================
\label{eq:foo}
--------------------------------------------------------------------------------
(document
  (label
    (cs)
    (group (l) (text) (r))))

================================================================================
pageref
================================================================================
\pageref{eq:foo}
--------------------------------------------------------------------------------
(document
  (ref
    (cs)
    (group (l) (text) (r))))

================================================================================
ref
================================================================================
\ref{eq:foo}
--------------------------------------------------------------------------------
(document
  (ref
    (cs)
    (group (l) (text) (r))))