 percentage of typos, and there are tools available to do
&gt;this kind of check,

What tools would those be?

&gt;  and you can also set database triggers to perform
&gt;the check on data entry.

Of course, and in the case of using an ontology, one would set a &quot;trigger&quot; 
to check the data using an ontology and theorem prover.  The other 
alternatives, are either to implement the trigger using procedural 
(imperative) code, or not at all.

Adam


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