--- a/doc/book/en/annexes/rql/intro.rst	Fri Jun 19 09:19:27 2009 +0200
+++ b/doc/book/en/annexes/rql/intro.rst	Fri Jun 19 20:38:32 2009 +0200
@@ -11,7 +11,7 @@
 user should see virtually no difference between an attribute and a
 relation).
 
-RQL is inspired by SQL but is the highest level. A knowledge of the 
+RQL is inspired by SQL but is the highest level. A knowledge of the
 `CubicWeb` schema defining the application is necessary.
 
 Comparison with existing languages
@@ -21,8 +21,8 @@
 ```
 RQL builds on the features of SQL but is at a higher level
 (the current implementation of RQL generates SQL). For that it is limited
-to the way of browsing relations and introduces variables. 
-The user does not need to know the model underlying SQL, but the `CubicWeb` 
+to the way of browsing relations and introduces variables.
+The user does not need to know the model underlying SQL, but the `CubicWeb`
 schema defining the application.
 
 Versa
@@ -30,16 +30,16 @@
 We should look in more detail, but here are already some ideas for
 the moment ... Versa_ is the language most similar to what we wanted
 to do, but the model underlying data being RDF, there is some
-number of things such as namespaces or handling of the RDF types which 
+number of things such as namespaces or handling of the RDF types which
 does not interest us. On the functionality level, Versa_ is very comprehensive
 including through many functions of conversion and basic types manipulation,
-which may need to be guided at one time or another. 
+which may need to be guided at one time or another.
 Finally, the syntax is a little esoteric.
 
 Sparql
 ``````
 The query language most similar to RQL is SPARQL_, defined by the W3C to serve
-for the semantic web. 
+for the semantic web.
 
 
 The different types of queries
@@ -59,7 +59,7 @@
 Delete entities or relationship (`DELETE`)
    Remove entities or relations existing in the database.
 
-   
+
 
 
 .. _Versa: http://uche.ogbuji.net/tech/rdf/versa/