entity and
&gt; relationship(/process) analytical processes available.
&gt; Some of this is covered at &lt;<A  HREF="http://www.idef.com">http://www.idef.com</A>&gt;
&gt; especially IDEF0 (process) and IDEF1X (data),
&gt; now also combined in "Object Role Modelling"
&gt; championed by Terry Halpin;  but also now
&gt; IDEF5 for ontologies.
&gt; 
&gt; I suggest what you are calling "a single data structure"
&gt; is only a portion of one.

Size does not matter.
It is their motility,
and the lack thereof.

&gt;