[an error occurred while processing this directive]
<h1>Graphs</h1>
<UL>
<li>
A graph comprises of <em>nSegment</em> number of segments and <em>nSegment
+ 1</em> number of nodes.  But there may be many visualisations of
the same node or segment.</li>
<li>
x&lt;i&gt; and f&lt;i&gt; have to be defined even though they may
not be used in the node/segment definitions.</li>
<li>
Both node and segment have to be defined.  Should no visualisation be
associated with either node or segment, define that variable to be <code>[]</code></li>
<li>
Due to DoNaLD's limitations, once a variable is declared as
one type, it cannot be redeclared to another type.  So if the first
visualisation of the node is a circle, any subsequent redefinition to the node
must have the first element declared as a circle.  However, you need not
give any definition to it. </li>
<li>
A DoNaLD graph will declare a series of node and segment entities
accessible in DoNaLD.  The nodes are named as <code>node1_1</code>,
<code>node1_2</code>, etc. and
the segments are named as <code>segment1_0</code>, <code>segment1_1</code>,
etc., where the first
number represents which visualisation of the entity and the second number is
concerned with which node or segment.  You can redefine the individual
nodes and segments without any complaint from the system (BUG?).</li>
</UL>

[an error occurred while processing this directive]