Merge pull request #14 from orbisgis/add_database_entry

Update quickstart.rst

docs/users/quickstart.rst

@@ -10,15 +10,26 @@ The workspace is the configuration of your User Interface *(UI)*.
 The following items are saved in the workspace:
 
 - opened windows (with their size and place in the UI),
-- datasources loaded into the Geocatalog,
-- loaded layers in the TOC.
+- database connection parameters,
+- map context file (loaded layers in the TOC),
+- toolbox parameters
+
+
+Database
+---------------
+
+OrbisGIS is build on top of a relational spatial database. All data are managed, queried from a JDBC driver.
+By default OrbisGIS starts with the embedded spatial database H2GIS. However, OrbisGIS could be connected to a PostgresSQL-PostGIS database.
+
 
 
 Load data
 ---------------
 
 To load data, just choose "Add" or "Import" in the Geocatalog.
 
+Note : because of OrbisGIS uses a RDBMS, a data is represented as a table and could be requested using the SQL languague.
+
 
 Display on the map
 ------------------