DROP TABLE IF EXISTS Scene;

CREATE TABLE Scene (

DROP TABLE IF EXISTS Pages;

CREATE TABLE Pages (

  id INTEGER PRIMARY KEY,  

  indexPosition INTEGER);

DROP TABLE IF EXISTS Widgets;

CREATE TABLE Widgets (

  id INTEGER PRIMARY KEY,

  uri TEXT,  

  pageId INTEGER);

DROP TABLE IF EXISTS WidgetPresentations;

CREATE TABLE WidgetPresentations (

  key TEXT,

  x REAL,

  y REAL,

  zValue REAL,	

  widgetId INTEGER,

  UNIQUE(widgetId, key) ON CONFLICT REPLACE,

  FOREIGN KEY(widgetId) REFERENCES Widgets(id) ON DELETE CASCADE);

DROP TABLE IF EXISTS WidgetPreferences;

CREATE TABLE WidgetPreferences (

  key TEXT,

  value TEXT,

  widgetId INTEGER,

  UNIQUE(widgetId, key) ON CONFLICT REPLACE,

  FOREIGN KEY(widgetId) REFERENCES Widgets(id) ON DELETE CASCADE);