--- a/doc/book/en/B020-define-schema.en.txt	Tue Dec 23 13:04:24 2008 -0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,22 +0,0 @@
-.. -*- coding: utf-8 -*-
-
-Data model definition (*schema*)
-================================
-
-The schema is the core piece of a `CubicWeb` application as it defines
-the data model handled. It is based on entities types already defined
-in the `CubicWeb` standard library and others, more specific, we would 
-expect to find in one or more Python files under the `schema` directory.
-
-At this point, it is important to make clear the difference between
-relation type and relation definition: a relation type is only a relation
-name with potentially other additionnal properties (see XXXX), whereas a 
-relation definition is a complete triplet 
-"<subject entity type> <relation type> <object entity type>". 
-A relation type could have been implied if none is related to a 
-relation definition of the schema.
-
-
-.. include:: B021-schema-stdlib.en.txt
-.. include:: B022-schema-definition.en.txt
-