on, whereby a first and a second are brought into relation.")
&gt; &gt;
&gt; &gt; (documentation Nexus  "A physical entity (P) mediating (M) two or
&gt; &gt;  more other entities.  Each nexus is a bundle of prehensions, which
&gt; &gt;  may be the junctures of an object or the participants of a process.
&gt; &gt;  Examples include an arch that consists of junctures of stones or
&gt; &gt;  an action that consists of what one participant called an agent
&gt; &gt;  is doing to another participant called a pati