--- a/rdf-concepts/index.html	Wed Nov 07 17:11:50 2012 +0000
+++ b/rdf-concepts/index.html	Thu Nov 08 16:38:06 2012 +0000
@@ -128,9 +128,9 @@
     specifications. The abstract syntax has two key data structures:
     RDF graphs are sets of subject-predicate-object triples,
     where the elements may be IRIs, blank nodes, or datatyped literals. They
-    are used to express descriptions of resources. RDF datasets comprise
-    a default graph and zero or more named graphs, and are used to to
-    express metadata about RDF graphs, and to organize data by context.
+    are used to express descriptions of resources. RDF datasets are used
+    to organize collections of RDF graphs, and comprise a default graph
+    and zero or more named graphs.
     This document also introduces key concepts and terminology, and discusses
     datatyping and the handling of fragment identifiers in IRIs within
     RDF graphs.</p>