http://code.activestate.com/recipes/tags/relationships/2012-01-05T08:58:40-08:00ActiveState Code Recipes2012-01-05T08:58:40-08:00Thomas Lehmannhttp://code.activestate.com/recipes/users/4174477/http://code.activestate.com/recipes/577975-simple-knowlegde-database/

<p style="color: grey"> Python recipe 577975 by <a href="/recipes/users/4174477/">Thomas Lehmann</a> (<a href="/recipes/tags/antagonisms/">antagonisms</a>, <a href="/recipes/tags/database/">database</a>, <a href="/recipes/tags/knowledge/">knowledge</a>, <a href="/recipes/tags/opposites/">opposites</a>, <a href="/recipes/tags/relationships/">relationships</a>). Revision 2. </p> <p><strong>What's the idea?</strong></p> <ul> <li>The idea is to be able to ask more successful questions than data provided.</li> <li>To have a kind of simple database</li> </ul> <p><strong>How is this done?</strong></p> <ul> <li>A releationship is always though as a from of older/younger or bigger/smaller. You have to define those opposite meanings by calling 'defineAntagonism'</li> <li>After this you can define a relationship by calling 'defineRelationship' using one of the opposite meanings and two ... I say names (can be persons or objects)</li> <li>When you define that somebody/someting is bigger than somebody/something else then you implicitly provide two information (bigger &lt;-> smaller)</li> <li>Also when defining - more commonly explained - that A &gt; B and B &gt; C then also A &gt; C and C &lt; A. </li> <li>That's the main logic implemented by this python code.</li> </ul> <p><strong>Special notes</strong></p> <ul> <li>We have to avoid inconsistent data; when it is defined that A &gt; B then you are not allowed to say that B &gt; A.</li> <li>We have to sort relations because they build up - I name it like this - a dependency chain. When a query checks for A &gt; C but A &gt; B and B &gt; C is defined only we need an order for searching.</li> </ul>