--- a/model/prov-dm.html	Thu Nov 01 22:39:53 2012 +0000
+++ b/model/prov-dm.html	Fri Nov 02 16:08:35 2012 +0000
@@ -2226,7 +2226,7 @@
   The implication here is that
      the resulting entity contains substantial content from the
      original.
-A <dfn>revision</dfn> relation is a particular case of a <a>derivation</a> relation between an entity and its revised version.
+A <dfn>revision</dfn> relation is a kind of <a>derivation</a> relation from a revised entity to an original  entity.
 The type of a revision relation 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.
@@ -2260,7 +2260,7 @@
 </p>
 
 <p>A <dfn>quotation</dfn> relation
- 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.
+ is a kind of  <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.
@@ -2311,7 +2311,7 @@
 
 <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 <a>derivation</a> relation from
+<p>A <dfn>primary source</dfn> relation is a kind 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