--- a/rdf-primer/index.html	Wed Nov 20 15:02:27 2013 +0100
+++ b/rdf-primer/index.html	Wed Nov 20 17:05:09 2013 +0100
@@ -381,6 +381,9 @@
       [[RDF11-CONCEPTS]] and RDF Semantics [[RDF11-MT]] documents. It
       should be noted that many RDF users in practice don't use blank nodes. </p> 
 
+      <p class="issue">Consider adding examples (in an appendix) of
+    simple use of blank nodes.</p>
+
     </section>
 
     <section id="subsection-multiple-graphs">
@@ -461,14 +464,15 @@
 
     <p>To support the definition of vocabularies RDF provides a
     vocabulary description language called RDF-Schema
-    [[!RDF-SCHEMA]]. This language allows one to define semantic constraints on
+    [[!RDF-SCHEMA]]. This language allows one to define semantic
+    characteristics of
     RDF data. For example, one can state that the IRI 
     <code>ex:friendOf</code> can be used as a predicate and that the subject and
     object of this property must be resources of class
     </code>ex:Person</code>. <p>
 
     <p>RDF Schema uses the notion of "class" to
-    model groups of resources that can act as subject or objects. The
+    model groups of resources that can act as subject or object. The
     term "property" is used to model predicates.  The main modeling
     constructs in RDF Schema are listed in the table below:
 
@@ -521,7 +525,7 @@
   </tbody>
 </table>
 
-<p class="note">The syntactic form (third column) is in a prefix
+<p class="note">The syntactic form (second column) is in a prefix
 notation wich will be 
 discussed in more detail in Sec. <a href="#section-graph-syntax">"Writing RDF
 Graphs"</a>. The fact that the constructs have two different prefixes
@@ -848,13 +852,9 @@
    </pre>
    
    <p class="note"</p>RDF Semantics distinguishes
-   a number of different "entailment regimes". For example, there
-   are "simple" entailments that are true for every RDF graph,
-   as well as entailments based on datatype semantics. Technically speaking,
-   the entailment in the example 
-   above is not sanctioned by the basic RDF model, but stems from the
-   semantic extension of RDF with the RDF Schema vocabulary. For detailed
-   information about entailment regimes and semantic extensions
+   a number of different "entailment regimes". The derivation above is
+   an example of an RDF Schema entailment. For detailed
+   information about entailment regimes 
    please consult the RDF Semantics document [[RDF11-MT]]. </p> 
 
    <p class="note">As we saw in the earlier <a