--- a/model/working-copy/towards-wd4.html	Mon Feb 13 08:53:59 2012 +0000
+++ b/model/working-copy/towards-wd4.html	Mon Feb 13 09:01:58 2012 +0000
@@ -213,13 +213,13 @@
 
 <p>A set of specifications, referred to as the PROV family of specifications, define the various aspects
 that are necessary to achieve this vision in an inter-operable
-way, the first of which is this document:</p>
+way:</p>
 <ul>
 <li>A data model for provenance, which is presented in three documents:
 <ul>
 <li> PROV-DM (part I): the provenance data model itself, expressed in natural language (this document);
-<li> PROV-DM-CONSTRAINTS (part II): constraints underpinning the data model (REF TO ADD);
-<li> PROV-ASN (part III): a notation to express instances of that data model for human consumption (REF TO ADD);
+<li> PROV-DM-CONSTRAINTS (part II): constraints underpinning the data model [[PROV-DM-CONSTRAINTS]];
+<li> PROV-ASN (part III): a notation to express instances of that data model for human consumption [[PROV-ASN]];
 </ul> 
 </li>
 
@@ -237,7 +237,7 @@
 
 <p>This specification intentionally presents the key concepts of the PROV Data Model, without drilling down into all its subtleties.  Using these key concepts, it becomes possible to write useful provenance assertions very quickly, and publish or embed them along side the data they relate to. </p>
 
-<p>However, it becomes challenging for provenance, like for any other form of metadata, when the data it is about changes. To address this challenge, an <em>upgrade path</em> is proposed to enrich simple provenance, with extra-descriptions that  help qualify the subject of provenance and provenance itself, with attributes and interval, intended to satisfy a comprehensive set of constraints.  These aspects are covered in the companion specification (PROV-DM part II, Ref to ADD).
+<p>However, it becomes challenging for provenance, like for any other form of metadata, when the data it is about changes. To address this challenge, an <em>upgrade path</em> is proposed to enrich simple provenance, with extra-descriptions that  help qualify the subject of provenance and provenance itself, with attributes and interval, intended to satisfy a comprehensive set of constraints.  These aspects are covered in the companion specification [[PROV-DM-CONSTRAINTS]].
 </p>
 
 
@@ -250,13 +250,14 @@
 applied to a short scenario, encoded in PROV-ASN, and illustrated
 graphically.</p>
 
-<p><a href="#data-model-concepts">Section 4</a> provides the normative definition of PROV-DM.</p>
+<p><a href="#data-model-concepts">Section 4</a> provides the definition of PROV-DM.</p>
 
 <p><a href="#common-relations">Section 5</a> introduces further relations offered by PROV-DM, including relations for data collections and domain-independent common relations.</p>
 
 <p><a href="#extensibility-section">Section 6</a> summarizes PROV-DM extensibility points.</p>
 
-<p><a href="#FurtherConsiderations">Section 7</a> discusses further considerations of the PROV data model.</p>
+<p><a href="#FurtherConsiderations">Section 7</a> introduces constraints that can be applied to the PROV data model 
+and that are covered in [[PROV-DM-CONSTRAINTS]].</p>
 
 
     </section> 
@@ -313,7 +314,7 @@
 
 
 <div class="anexample" id="entity-example">
-An entity may be the document at URI <a href="http://www.w3.org/TR/prov-dm/">http://www.w3.org/TR/prov-dm/</a>, a file in a file system, a car or an idea.
+<p>An entity may be the document at URI <a href="http://www.w3.org/TR/prov-dm/">http://www.w3.org/TR/prov-dm/</a>, a file in a file system, a car or an idea.</p>
 </div>
 
 
@@ -380,8 +381,8 @@
 
 <p>Activities are consumers of entities and producers of entities. In some case, the consumption of entity influences the creation of another in some way. This notion is captured by derivations, defined as follows.</p>
 
-<p><dfn title="concept-derivation">Derivation</dfn> is the fact that some entity is transformed from, created from, or affected by another entity in the world.  </p>
-<!-- doesn't seem right to say fact, should I use influence? -->
+<p><dfn title="concept-derivation">Derivation</dfn> is something by which some entity is transformed from, created from, or affected by another entity in the world.  </p>
+
 
 <div class="anexample" id="derivation-example">
 <p>Examples of derivation include  the transformation of a relational table into a