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On 15.12.2010 10:01, Diego San Esteban wrote:
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<pre><span class="hps"><span
style="font-family: "Verdana","sans-serif";" lang="EN">Greetings,<o:p></o:p></span></span></pre>
<pre><span class="hps"><span
style="font-family: "Verdana","sans-serif";" lang="EN"><o:p> </o:p></span></span></pre>
<pre><span class="hps"><span
style="font-family: "Verdana","sans-serif";" lang="EN">How is</span></span><span
style="font-family: "Verdana","sans-serif";" lang="EN"> it <span
class="hps">possible to implement a</span> <span class="hps">"</span>rollback" <span
class="hps">in</span> the <span class="hps">KB</span>?
<span class="hps">Suppose</span> <span class="hps">that when retracting</span> a<span
class="hps"> fact</span>, <span class="hps">I</span> want to <span
class="hps">undo the</span> <span class="hps">changes</span> <span
class="hps">made.</span></span>
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<br>
A very simple, yet effective solution would be to exclusively use
insertLogical(). No updates to facts which are already asserted, no
normal "insert".<br>
<br>
Best regards<br>
<br>
Ansgar<br>
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