--- a/model/prov-dm.html	Thu Nov 01 07:58:33 2012 +0000
+++ b/model/prov-dm.html	Thu Nov 01 08:44:25 2012 +0000
@@ -2226,24 +2226,12 @@
   The implication here is that
      the resulting entity contains substantial content from the
      original.
-Revision is a particular case of <a>derivation</a> of an entity into its revised version.
+A <dfn>revision</dfn> relation is a particular case of a <a>derivation</a> relation between an entity and its revised version.
 The type is of a revision derivation is denoted by:
 <dfn title="dfn-prov:revision" id="dfn-prov:revision"><span class="name">prov:Revision</span></dfn>.
 PROV defines no revision-specific attributes.
 </p>
 
-<!-- <p> A <dfn title="wasRevisionOf">revision</dfn> relation<span class="withPn">, written <span class="pnExpression">wasRevisionOf(id; e2, e1, a, g2, u1, attrs)</span> in PROV-N,</span> has:</p>
-<ul>
-<li><span class='attribute' id="revision.id">id</span>: an OPTIONAL identifier for the relation;</li> 
-<li><span class='attribute' id="revision.newer">newer</span>: the identifier (<span class="name">e2</span>) of the revised  entity;
-<li><span class='attribute' id="revision.older">older</span>: the identifier (<span class="name">e1</span>) of the older entity;
-<li><span class='attribute' id="revision.activity">activity</span>: an OPTIONAL identifier (<span class="name">a</span>) for the activity using and generating the above entities;</li>
-<li><span class='attribute' id="revision.generation">generation</span>: an OPTIONAL identifier (<span class="name">g2</span>) for the generation involving the generated entity (<span class="name">e2</span>) and activity;</li> 
-<li><span class='attribute' id="revision.usage">usage</span>: an OPTIONAL identifier (<span class="name">u1</span>) for the usage involving the used entity (<span class="name">e1</span>) and activity;</li> 
-<li><span class='attribute' id="revision.attributes">attributes</span>: an OPTIONAL set (<span class="name">attrs</span>) of attribute-value pairs representing additional information about this relation.</li>
-</ul>
--->
-
 
 <div class="anexample" id="anexample-revision">
 <p>
@@ -2272,7 +2260,7 @@
 </p>
 
 <p>A <dfn>quotation</dfn> relation
- is a particular case of  <a>derivation</a> in which an entity is derived from an original entity by copying, or "quoting", some or all of it.
+ is a particular case of a  <a>derivation</a> relation, for which an entity was derived from an original entity by copying, or "quoting", some or all of it.
 The type is of a quotation derivation is denoted by:
 <dfn title="dfn-prov:quotation" id="dfn-prov:quotation"><span class="name">prov:Quotation</span></dfn>.
 PROV defines no quotation-specific attributes.
@@ -2323,8 +2311,8 @@
 
 <p>It is also important to note that a given entity might be a primary source for one entity but not another. It the reason why Primary Source is defined as a relation as opposed to a subtype of Entity.</p>
 
-<p>A <dfn>primary source</dfn> relation is a particular case of <a>derivation</a> of
-secondary materials from their primary sources. It is recognized that
+<p>A <dfn>primary source</dfn> relation is a particular case of a <a>derivation</a> relation from
+secondary materials to their primary sources. It is recognized that
 the determination of primary sources can be up to interpretation, and
 should be done according to conventions accepted within the
 application's domain.