--- a/model/ProvenanceModel.html	Wed Dec 21 21:28:49 2011 +0000
+++ b/model/ProvenanceModel.html	Thu Dec 22 07:38:03 2011 +0000
@@ -2663,7 +2663,7 @@
 </div>
 
 
-<li> The  attribute <dfn id="dfn-steps"><span class="name">prov:steps</span></dfn>  defines the level of precision associated with a derivation record. The value associated with a <span class="name">prov:steps</span> attribute  MUST be   <span class="name">"1"</span> or <span class="name">"n"</span>. The attribute <span class="name">prov:step</span> occurs at most once in a derivation record.</li>
+<li> The  attribute <dfn id="dfn-steps"><span class="name">prov:steps</span></dfn>  defines the level of precision associated with a derivation record. The value associated with a <span class="name">prov:steps</span> attribute  MUST be   <span class="name">"1"</span> or <span class="name">"n"</span>. The attribute <span class="name">prov:step</span> occurs at most once in a derivation record. A derivation record without attribute <span class="name">prov:step</span> is considered to be equivalent to the same record extended with an extra attribute  <span class="name">prov:step</span> and associated value <span class="name">"n"</span>. </li>
 
 </ul>
 </section>