he note about record-based nodes at the
<A HREF=#top>top</A> of this page. Also note that there are problems using 
non-trivial edges (edges with ports or labels) between adjacent
nodes on the same rank if one or both nodes has a record shape.
<P>
These are specified by shape values of "record" and "Mrecord".
The structure of a record-based node is determined by 
its <A HREF=attrs.html#d:label><TT>label</TT></A>,
which has the following schema:
  <TABLE>
  <TR><TD ALIGN=right><I>rlabel</I><TD>=<TD><I>field<