--- a/glossary/index.html	Wed Mar 20 10:31:41 2013 +0100
+++ b/glossary/index.html	Wed Mar 20 11:34:28 2013 +0100
@@ -367,7 +367,7 @@
 
 <section>
 <h4 >Ontology</h4>
-Ontology is a formal representation of relationships between items or concepts in a directed graph structure.  An ontology defines the <a href="#predicate">predicates</a> themselves, but also defines the data type of each predicate and the relationship, if any, of one predicate to another.  RDF/XML and Web Ontology Language (OWL) are popular markup languages for ontologies. See also [<a href="#taxonomy">taxonomy</a>].
+An ontology is a formal model of a domain. It describes the types of things that exist (classes), the relationships between them (properties) and the logical ways those classes and properties can be used together (axioms). The OWL (Web Ontology Language) family of languages provide a standardized-means for expressing and exchanging ontologies. It builds upon, and is compatible with, <a href="#rdf">RDF</a>.
 
 </section>
 
@@ -480,7 +480,7 @@
 
 <section>
 <h4>RDF Schema</h4>
-RDF Schema (RDFS) [[!RDFS]] is the schema language for RDF; it describes constructs for types of objects (Classes), relating types to one another (subClasses), properties that describe objects (Properties), and relationships between them (subProperty).  
+RDF Schema (RDFS) [[!RDFS]] is the vocabulary language for RDF; it describes constructs for types of objects (Classes), relating types to one another (subClasses), properties that describe objects (Properties), and relationships between them (subProperty).  
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