Updated CMS node and blog to remove extension data.

Comments: minor update.

Updated CMS_NODE_STORAGE_I API.
Delete a node using a node as formal parameter instead of node id.
Clean code and update log information.

Added precondition to delete node to accept nodes with a valid a id.

Added missing assertions tag names.

modules/node/persistence/cms_node_storage_i.e

@@ -44,7 +44,7 @@ feature {NONE} -- Implementation
 	extended_store (a_node: CMS_NODE)
 			-- Store extended data from `a_node'.
 		require
-			not error_handler.has_error
+			not_has_error: not error_handler.has_error
 		do
 			if attached node_storage_extension (a_node) as ext then
 				ext.store_node (a_node)
@@ -54,13 +54,23 @@ feature {NONE} -- Implementation
 	extended_load (a_node: CMS_NODE)
 			-- Load extended data into `a_node'.
 		require
-			not error_handler.has_error
+			not_has_error: not error_handler.has_error
 		do
 			if attached node_storage_extension (a_node) as ext then
 				ext.load_node (a_node)
 			end
 		end
 
+	extended_delete (a_node: CMS_NODE)
+			-- Delete extended data related to node `a_node'.
+		require
+			not_has_error: not error_handler.has_error
+		do
+			if attached node_storage_extension (a_node) as ext then
+				ext.delete_node (a_node)
+			end
+		end
+
 feature -- Access		
 
 	nodes_count: NATURAL_64
@@ -165,16 +175,19 @@ feature -- Change: Node
 
 	delete_node (a_node: CMS_NODE)
 			-- Delete `a_node'.
+		require
+				valid_node_id: a_node.has_id
 		do
-			if a_node.has_id then
-				delete_node_by_id (a_node.id)
-			end
+				-- TODO
+				-- Check if we need to use a transaction
+				-- we delete a node
+				-- node_revisions
+				-- and extensions (PAGE, BLOG, etc).
+			delete_node_base (a_node)
 		end
 
-	delete_node_by_id (a_id: INTEGER_64)
-			-- Remove node by id `a_id'.
-		require
-			valid_node_id: a_id > 0
+	delete_node_base (a_node: CMS_NODE)
+			-- Remove node `a_node'.
 		deferred
 		end