--- a/rdf-primer/index.html	Mon Nov 11 23:44:13 2013 +0100
+++ b/rdf-primer/index.html	Tue Nov 12 00:35:12 2013 +0100
@@ -424,7 +424,7 @@
     part of the same (large) graph. In practice, RDF tool builders and
     data managers needed a mechanism to talk about subsets of
     triples. Multiple graphs were first introduced in the RDF query
-    language SPAQL. The RDF data model was therefore extended with a notion of
+    language SPARQL. The RDF data model was therefore extended with a notion of
     multiple graphs that is closely aligned with SPARQL. </p> 
 
     </section>
@@ -435,7 +435,26 @@
 
     <h2>RDF Vocabularies</h2>
 
-    <p></p>
+    <p>The RDF data model provides a way to make statements about
+    (Web) respources. As we mentioned, this data model does not make any
+    assumptions about what these resources stand for. In practice, RDF
+    is typically used in combination with vocabularies or other
+    conventions that provide semantic information about these
+    resources.For example, if you put the VIAF IRI for Leonardo da
+    Vinci (see Sec. <a href="#subsection-IRI">"IRI"</a>) in your
+    browser you will see a page with information about this
+    artist. VIAF maintains, amonhst others, 15 million of such person
+    records. @@ ref  </p>
+
+    <p class="note">Your browser will display a HTML page. Content
+    negotiation allows you to get the data in other formats, such as
+    RDF. </p>
+
+    <p>To support the definition of vocabularies RDF provides an RDF
+    Vocabulary Description Language called RDF-Schema [[!RDF-SCHEMA]].
+    
+
+    <p>@@ Discuss FOAF, Dublin Core, schema.org and WordNet as typical examples</p>
 
 </section>