A>&gt; 
&gt; &gt; Subject:	RE: SUO: RE: Re: More KIF-ified Ontology Content
&gt; &gt; 
&gt; &gt; Dear Graham,
&gt; &gt; 
&gt; &gt; I would say that there are 3 basic types of thing:
&gt; &gt; 
&gt; &gt; 1. things that have an extension (exist) in space time (I 
&gt; &gt; would call these individuals - but this is a broader use than 
&gt; &gt; some would give this word).
&gt; &gt; 
&gt; &gt; 2. Things that have members (rather than parts), such as
&gt; &gt; classes/sets/collections. These are timeless.
&gt; 