diff --git a/cms-safe.ecf b/cms-safe.ecf
index 03e697d..0c11bd8 100644
--- a/cms-safe.ecf
+++ b/cms-safe.ecf
@@ -15,7 +15,6 @@
 		<library name="json" location="$ISE_LIBRARY\contrib\library\text\parser\json\library\json-safe.ecf" readonly="false"/>
 		<library name="layout" location=".\library\layout\layout-safe.ecf"/>
 		<library name="model" location=".\library\model\cms_model-safe.ecf" readonly="false"/>
-		<library name="persistence_mysql" location=".\library\persistence\implementation\mysql\persistence_mysql-safe.ecf" readonly="false"/>
 		<library name="smarty" location="$ISE_LIBRARY\contrib\library\text\template\smarty\smarty-safe.ecf" readonly="false"/>
 		<library name="text_filter" location="$ISE_LIBRARY\unstable\library\text\text_filter\text_filter-safe.ecf"/>
 		<library name="time" location="$ISE_LIBRARY\library\time\time-safe.ecf"/>
diff --git a/examples/demo/demo-safe.ecf b/examples/demo/demo-safe.ecf
index e09123b..19227ff 100644
--- a/examples/demo/demo-safe.ecf
+++ b/examples/demo/demo-safe.ecf
@@ -12,6 +12,8 @@
 		<library name="base" location="$ISE_LIBRARY\library\base\base-safe.ecf"/>
 		<library name="cms" location="..\..\cms-safe.ecf" readonly="false"/>
 		<library name="cms_demo_module" location="modules\demo\cms_demo_module-safe.ecf" readonly="false"/>
+		<library name="persistence_mysql" location="..\..\library\persistence\implementation\mysql\persistence_mysql-safe.ecf" readonly="false"/>
+
 		<library name="layout" location="..\..\library\layout\layout-safe.ecf" readonly="false"/>
 		<library name="wsf" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\wsf-safe.ecf"/>
 		<library name="wsf_extension" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\wsf_extension-safe.ecf" readonly="false"/>
diff --git a/examples/demo/site/config/cms.ini b/examples/demo/site/config/cms.ini
index 05a3774..f434169 100644
--- a/examples/demo/site/config/cms.ini
+++ b/examples/demo/site/config/cms.ini
@@ -1,6 +1,11 @@
-engine=smarty
-site.name=EWF Web CMS
-site.email=your@email.com
-var-dir=var
-files-dir=files
+[layout]
+root-dir=site/www
+themes-dir=site/themes
+
+[site]
+name=Eiffel CMS
+email=your@email.com
 theme=bootstrap
+
+[misc]
+smtp=localhost
diff --git a/examples/demo/src/ewf_roc_server.e b/examples/demo/src/ewf_roc_server.e
index 3fb8aca..7c47c72 100644
--- a/examples/demo/src/ewf_roc_server.e
+++ b/examples/demo/src/ewf_roc_server.e
@@ -147,6 +147,8 @@ feature -- CMS setup
 			debug ("refactor_fixme")
 				to_implement ("To implement custom storage")
 			end
+			a_setup.storage_drivers.force (create {CMS_STORAGE_MYSQL_BUILDER}.make, "mysql")
 		end
+
 end
 
diff --git a/library/layout/src/logger/shared_logger.e b/library/layout/src/logger/shared_logger.e
index 9f6996f..ed0051e 100644
--- a/library/layout/src/logger/shared_logger.e
+++ b/library/layout/src/logger/shared_logger.e
@@ -1,7 +1,7 @@
 note
 	description: "Provides logger information"
-	date: "$Date: 2014-08-20 15:21:15 -0300 (mi., 20 ago. 2014) $"
-	revision: "$Revision: 95678 $"
+	date: "$Date: 2015-01-15 00:00:58 +0100 (jeu., 15 janv. 2015) $"
+	revision: "$Revision: 96461 $"
 
 class
 	SHARED_LOGGER
@@ -29,7 +29,7 @@ feature -- Logger
 			create l_environment
 			if attached separate_character_option_value ('d') as l_dir then
 				l_path := create {PATH}.make_from_string (l_dir)
-				create l_log_writer.make_at_location (l_path.extended ("..").appended ("\api.log"))
+				create l_log_writer.make_at_location (l_path.extended ("logs").appended ("\api.log"))
 			else
 				l_path := create {PATH}.make_current
 				create l_log_writer.make_at_location (l_path.extended("api.log"))
@@ -107,6 +107,6 @@ feature {NONE} -- JSON
 		end
 
 note
-	copyright: "2011-2014, Javier Velilla, Jocelyn Fiat, Eiffel Software and others"
+	copyright: "2011-2015, Javier Velilla, Jocelyn Fiat, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 end
diff --git a/library/persistence/implementation/common/database/database_handler.e b/library/persistence/implementation/common/database/database_handler.e
index 3517ff3..02fdb7b 100644
--- a/library/persistence/implementation/common/database/database_handler.e
+++ b/library/persistence/implementation/common/database/database_handler.e
@@ -45,14 +45,14 @@ feature -- Functionality Store Procedures
 	execute_store_reader
 			-- Execute a `store' to read data.
 		require
-			store_not_void: store /= void
+			store_not_void: store /= Void
 		deferred
 		end
 
 	execute_store_writer
 			-- Execute a `store' to write data.
 		require
-			store_not_void: store /= void
+			store_not_void: store /= Void
 		deferred
 		end
 
@@ -61,14 +61,14 @@ feature -- SQL Queries
 	execute_query
 			-- Execute sql query, the read data from the database.
 		require
-			query_not_void: query /= void
+			query_not_void: query /= Void
 		deferred
 		end
 
 	execute_change
 			-- Execute sql query that update/add data.
 		require
-			query_not_void: query /= void
+			query_not_void: query /= Void
 		deferred
 		end
 
diff --git a/library/persistence/implementation/mysql/persistence_mysql-safe.ecf b/library/persistence/implementation/mysql/persistence_mysql-safe.ecf
index 218e80c..d5cef36 100644
--- a/library/persistence/implementation/mysql/persistence_mysql-safe.ecf
+++ b/library/persistence/implementation/mysql/persistence_mysql-safe.ecf
@@ -7,6 +7,7 @@
 		</option>
 		<setting name="console_application" value="true"/>
 		<library name="base" location="$ISE_LIBRARY\library\base\base-safe.ecf"/>
+		<library name="cms" location="..\..\..\..\cms-safe.ecf"/>
 		<library name="crypto" location="$ISE_LIBRARY\unstable\library\text\encryption\crypto\crypto-safe.ecf"/>
 		<library name="encoder" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\text\encoder\encoder-safe.ecf"/>
 		<library name="error" location="$ISE_LIBRARY\contrib\library\utility\general\error\error-safe.ecf"/>
@@ -23,7 +24,6 @@
 				<exclude>/database/database_connection_odbc.e</exclude>
 			</file_rule>
 		</cluster>
-		<cluster name="interface" location="..\..\interface\" recursive="true"/>
 		<cluster name="persistence_mysql" location=".\src\" recursive="true">
 			<file_rule>
 				<exclude>/EIFGENs$</exclude>
diff --git a/library/persistence/implementation/mysql/src/cms_storage_mysql_builder.e b/library/persistence/implementation/mysql/src/cms_storage_mysql_builder.e
new file mode 100644
index 0000000..b651db3
--- /dev/null
+++ b/library/persistence/implementation/mysql/src/cms_storage_mysql_builder.e
@@ -0,0 +1,35 @@
+note
+	description: "[
+			Objects that ...
+		]"
+	author: "$Author$"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_STORAGE_MYSQL_BUILDER
+
+inherit
+	CMS_STORAGE_BUILDER
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make
+			-- Initialize `Current'.
+		do
+		end
+
+feature -- Factory
+
+	storage (a_setup: CMS_SETUP): detachable CMS_STORAGE_MYSQL
+		do
+			if attached (create {APPLICATION_JSON_CONFIGURATION_HELPER}).new_database_configuration (a_setup.layout.application_config_path) as l_database_config then
+				create Result.make (create {DATABASE_CONNECTION_MYSQL}.login_with_connection_string (l_database_config.connection_string))
+			end
+		end
+
+
+end
diff --git a/library/src/configuration/cms_default_setup.e b/library/src/configuration/cms_default_setup.e
index cad0c09..d73a4f6 100644
--- a/library/src/configuration/cms_default_setup.e
+++ b/library/src/configuration/cms_default_setup.e
@@ -31,7 +31,10 @@ feature {NONE} -- Initialization
 		do
 			configure
 			create modules.make (3)
+			create storage_drivers.make (2)
+
 			build_mailer
+			initialize_storages
 			initialize_modules
 		end
 
@@ -72,6 +75,12 @@ feature {NONE} -- Initialization
 			compute_theme_assets_location
 		end
 
+	initialize_storages
+			-- Initialize storages
+		do
+			storage_drivers.force (create {CMS_STORAGE_NULL_BUILDER}, "null")
+		end
+
 	initialize_modules
 				-- Intialize core modules.
 		local
@@ -144,6 +153,11 @@ feature -- Access
 			to_implement ("Not implemented mailer")
 		end
 
+feature -- Access: storage
+
+	storage_drivers: STRING_TABLE [CMS_STORAGE_BUILDER]
+			-- Precursor	
+
 feature -- Element change
 
 	register_module (m: CMS_MODULE)
diff --git a/library/src/configuration/cms_setup.e b/library/src/configuration/cms_setup.e
index e1218e6..8a0383e 100644
--- a/library/src/configuration/cms_setup.e
+++ b/library/src/configuration/cms_setup.e
@@ -6,6 +6,9 @@ note
 deferred class
 	CMS_SETUP
 
+inherit
+	REFACTORING_HELPER
+
 feature -- Access
 
 	layout: CMS_LAYOUT
@@ -88,7 +91,6 @@ feature -- Query
 		deferred
 		end
 
-
 feature -- Access: Theme	
 
 	themes_location: PATH
@@ -109,6 +111,54 @@ feature -- Access: Theme
 	theme_name: READABLE_STRING_32
 			-- theme name.
 
+feature -- Access: storage
+
+	storage_drivers: STRING_TABLE [CMS_STORAGE_BUILDER]
+		deferred
+		end
+
+	storage (a_error_handler: ERROR_HANDLER): detachable CMS_STORAGE
+		local
+			retried: BOOLEAN
+			l_message: STRING
+		do
+			if not retried then
+				to_implement ("Refactor database setup")
+				if
+					attached (create {APPLICATION_JSON_CONFIGURATION_HELPER}).new_database_configuration (layout.application_config_path) as l_database_config and then
+					attached storage_drivers.item (l_database_config.driver) as l_builder
+				then
+					Result := l_builder.storage (Current)
+				else
+					create {CMS_STORAGE_NULL} Result
+				end
+			else
+				to_implement ("Workaround code, persistence layer does not implement yet this kind of error handling.")
+					-- error hanling.
+				create {CMS_STORAGE_NULL} Result
+				create l_message.make (1024)
+				if attached ((create {EXCEPTION_MANAGER}).last_exception) as l_exception then
+					if attached l_exception.description as l_description then
+						l_message.append (l_description.as_string_32)
+						l_message.append ("%N%N")
+					elseif attached l_exception.trace as l_trace then
+						l_message.append (l_trace)
+						l_message.append ("%N%N")
+					else
+						l_message.append (l_exception.out)
+						l_message.append ("%N%N")
+					end
+				else
+					l_message.append ("The application crash without available information")
+					l_message.append ("%N%N")
+				end
+				a_error_handler.add_custom_error (0, " Database Connection ", l_message)
+			end
+		rescue
+			retried := True
+			retry
+		end
+
 feature -- Element change
 
 	register_module (m: CMS_MODULE)
diff --git a/library/persistence/interface/cms_storage.e b/library/src/persistence/cms_storage.e
similarity index 100%
rename from library/persistence/interface/cms_storage.e
rename to library/src/persistence/cms_storage.e
diff --git a/library/src/persistence/cms_storage_builder.e b/library/src/persistence/cms_storage_builder.e
new file mode 100644
index 0000000..5880d55
--- /dev/null
+++ b/library/src/persistence/cms_storage_builder.e
@@ -0,0 +1,18 @@
+note
+	description: "[
+			Objects that ...
+		]"
+	author: "$Author$"
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	CMS_STORAGE_BUILDER
+
+feature -- Factory
+
+	storage (a_setup: CMS_SETUP): detachable CMS_STORAGE
+		deferred
+		end
+
+end
diff --git a/library/persistence/implementation/common/cms_storage_null.e b/library/src/persistence/cms_storage_null.e
similarity index 100%
rename from library/persistence/implementation/common/cms_storage_null.e
rename to library/src/persistence/cms_storage_null.e
diff --git a/library/src/persistence/cms_storage_null_builder.e b/library/src/persistence/cms_storage_null_builder.e
new file mode 100644
index 0000000..633084f
--- /dev/null
+++ b/library/src/persistence/cms_storage_null_builder.e
@@ -0,0 +1,22 @@
+note
+	description: "[
+			Objects that ...
+		]"
+	author: "$Author$"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_STORAGE_NULL_BUILDER
+
+inherit
+	CMS_STORAGE_BUILDER
+
+feature -- Factory
+
+	storage (a_setup: CMS_SETUP): detachable CMS_STORAGE_NULL
+		do
+			create Result
+		end
+
+end
diff --git a/library/src/service/cms_api.e b/library/src/service/cms_api.e
index 7476eb4..c6abbe0 100644
--- a/library/src/service/cms_api.e
+++ b/library/src/service/cms_api.e
@@ -31,46 +31,13 @@ feature -- Initialize
 
 	initialize
 				-- Initialize the persitent layer.
-		local
-			l_database: DATABASE_CONNECTION
-			retried: BOOLEAN
-			l_message: STRING
 		do
-			if not retried then
-				to_implement ("Refactor database setup")
-				if attached (create {APPLICATION_JSON_CONFIGURATION_HELPER}).new_database_configuration (setup.layout.application_config_path) as l_database_config then
-					create {DATABASE_CONNECTION_MYSQL} l_database.login_with_connection_string (l_database_config.connection_string)
-					create {CMS_STORAGE_MYSQL} storage.make (l_database)
-				else
-					create {DATABASE_CONNECTION_NULL} l_database.make_common
-					create {CMS_STORAGE_NULL} storage
-				end
+			to_implement ("Refactor database setup")
+			if attached setup.storage (error_handler) as l_storage then
+				storage := l_storage
 			else
-				to_implement ("Workaround code, persistence layer does not implement yet this kind of error handling.")
-					-- error hanling.
-				create {DATABASE_CONNECTION_NULL} l_database.make_common
 				create {CMS_STORAGE_NULL} storage
-				create l_message.make (1024)
-				if attached ((create {EXCEPTION_MANAGER}).last_exception) as l_exception then
-					if attached l_exception.description as l_description then
-						l_message.append (l_description.as_string_32)
-						l_message.append ("%N%N")
-					elseif attached l_exception.trace as l_trace then
-						l_message.append (l_trace)
-						l_message.append ("%N%N")
-					else
-						l_message.append (l_exception.out)
-						l_message.append ("%N%N")
-					end
-				else
-					l_message.append ("The application crash without available information")
-					l_message.append ("%N%N")
-				end
-				error_handler.add_custom_error (0, " Database Connection ", l_message)
 			end
-		rescue
-			retried := True
-			retry
 		end
 
 feature -- Access: Error
@@ -110,7 +77,7 @@ feature -- Status Report
 
 feature -- Access: Node
 
-	nodes: LIST[CMS_NODE]
+	nodes: LIST [CMS_NODE]
 			-- List of nodes.
 		do
 			debug ("refactor_fixme")