> assigns a portname to the field and can 
be combined with the node name to indicate where to attach an edge
to the node. (See <A HREF=attrs.html#k:portPos>portPos</A>.)
The second string is used as the text for the field; it supports the usual
<A HREF=attrs.html#k:escString>escape sequences</A> &#92;n, &#92;l and &#92;r.
<P>
Visually, a record is a box, with fields represented by alternating
rows of horizontal or vertical subboxes. The Mrecord shape is identical
to a record shape, except that the outermos