diff --git a/Common.cpp b/Common.cpp
index 5a7da35..fd13f09 100644
--- a/Common.cpp
+++ b/Common.cpp
@@ -2,6 +2,7 @@
  * Common.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/DestinationGLCanvas.cpp b/DestinationGLCanvas.cpp
index d9a5660..d240e86 100644
--- a/DestinationGLCanvas.cpp
+++ b/DestinationGLCanvas.cpp
@@ -2,6 +2,7 @@
  * DestinationGLCanvas.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/MainWindow.cpp b/MainWindow.cpp
index 771cf7d..2ddec44 100644
--- a/MainWindow.cpp
+++ b/MainWindow.cpp
@@ -2,6 +2,7 @@
  * MainWindow.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -18,6 +19,7 @@
  */
 
 #include "MainWindow.h"
+#include "ProjectWriter.h"
 
 MainWindow::MainWindow()
 {
@@ -146,8 +148,8 @@ bool MainWindow::save()
 
 bool MainWindow::saveAs()
 {
-  QString fileName = QFileDialog::getSaveFileName(this, tr("Save mapping"),
-      ".", tr("Libremapping files (*.lmp)"));
+  QString fileName = QFileDialog::getSaveFileName(this, tr("Save mapping project"),
+      ".", tr("LibreMapping files (*.lmp)"));
   if (fileName.isEmpty())
     return false;
 
@@ -537,16 +539,25 @@ bool MainWindow::loadFile(const QString &fileName)
 
 bool MainWindow::saveFile(const QString &fileName)
 {
-  // TODO: Try to write file.
-//  if (!spreadsheet->writeFile(fileName))
-//  {
-//    statusBar()->showMessage(tr("Saving canceled"), 2000);
-//    return false;
-//  }
+  QFile file(fileName);
+  if (! file.open(QFile::WriteOnly | QFile::Text))
+  {
+    QMessageBox::warning(this, tr("Error saving mapping project"),
+      tr("Cannot write file %1:\n%2.")
+        .arg(fileName)
+        .arg(file.errorString()));
+    return false;
+  }
 
-  setCurrentFile(fileName);
-  statusBar()->showMessage(tr("File saved"), 2000);
-  return true;
+  ProjectWriter writer(mappingManager);
+  if (writer.writeFile(&file))
+  {
+    setCurrentFile(fileName);
+    statusBar()->showMessage(tr("File saved"), 2000);
+    return true;
+  }
+  else
+    return false;
 }
 
 void MainWindow::setCurrentFile(const QString &fileName)
diff --git a/Mapper.cpp b/Mapper.cpp
index a203f87..4591c4f 100644
--- a/Mapper.cpp
+++ b/Mapper.cpp
@@ -2,6 +2,7 @@
  * Mapper.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/MapperGLCanvas.cpp b/MapperGLCanvas.cpp
index 9717451..363f8bc 100644
--- a/MapperGLCanvas.cpp
+++ b/MapperGLCanvas.cpp
@@ -2,6 +2,7 @@
  * MapperGLCanvas.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/MappingManager.cpp b/MappingManager.cpp
index 48d7898..cf6332d 100644
--- a/MappingManager.cpp
+++ b/MappingManager.cpp
@@ -2,6 +2,7 @@
  * MappingManager.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/ProjectWriter.cpp b/ProjectWriter.cpp
new file mode 100644
index 0000000..3cbc69e
--- /dev/null
+++ b/ProjectWriter.cpp
@@ -0,0 +1,103 @@
+/*
+ * MainWindow.cpp
+ *
+ * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "ProjectWriter.h"
+#include <sstream>
+
+ProjectWriter::ProjectWriter(MappingManager *manager) :
+    _manager(manager)
+{
+  _xml.setAutoFormatting(true);
+}
+
+bool ProjectWriter::writeFile(QIODevice *device)
+{
+  _xml.setDevice(device);
+  
+  _xml.writeStartDocument();
+  _xml.writeDTD("<!DOCTYPE libremapping>");
+  _xml.writeStartElement("project");
+  _xml.writeAttribute("version", "1.0");
+
+  for (int i = 0; i < _manager->nPaints(); i++)
+    writeItem(_manager->getPaint(i).get());
+
+  for (int i = 0; i < _manager->nMappings(); i++)
+    writeItem(_manager->getMapping(i).get());
+
+  _xml.writeEndDocument();
+  return true;
+}
+
+void ProjectWriter::writeItem(Paint *item)
+{
+  _xml.writeStartElement("paint");
+  _xml.writeAttribute("id", "FIXME");
+  _xml.writeAttribute("type", "image");
+
+  // FIXME: check paint type before casting to Image
+  Image *image = (Image *) item;
+
+  _xml.writeTextElement("uri", image->getImagePath());
+  {
+    std::ostringstream os;
+    os << image->getWidth();
+    _xml.writeTextElement("width", os.str().c_str());
+  }
+
+  {
+    std::ostringstream os;
+    os << image->getHeight();
+    _xml.writeTextElement("height", os.str().c_str());
+  }
+
+  _xml.writeEndElement();
+  //_xml.writeEmptyElement("hello");
+}
+
+void ProjectWriter::writeItem(Mapping *item)
+{
+  _xml.writeStartElement("mapping");
+  _xml.writeAttribute("id", "FIXME");
+  // TODO: item->getPaint()->getId();
+  _xml.writeAttribute("paint_id", "FIXME");
+
+  Shape *shape = item->getShape().get();
+  _xml.writeStartElement("shape");
+  _xml.writeAttribute("type", shape->getShapeType());
+  for (int i = 0; i < shape->nVertices(); i++)
+  {
+    const Point & point = shape->getVertex(i);
+    _xml.writeStartElement("vertex");
+    {
+      std::ostringstream os;
+      os << point.x;
+      _xml.writeAttribute("x", os.str().c_str());
+    }
+    {
+      std::ostringstream os;
+      os << point.y;
+      _xml.writeAttribute("y", os.str().c_str());
+    }
+    _xml.writeEndElement(); // vertex
+  }
+  _xml.writeEndElement(); // shape
+  _xml.writeEndElement(); // mapping
+}
+
diff --git a/ProjectWriter.h b/ProjectWriter.h
new file mode 100644
index 0000000..05ce4cc
--- /dev/null
+++ b/ProjectWriter.h
@@ -0,0 +1,37 @@
+/*
+ * MainWindow.cpp
+ *
+ * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <QXmlStreamWriter>
+#include "MappingManager.h"
+#include "Mapping.h"
+#include "Paint.h"
+
+class ProjectWriter
+{
+  public:
+    ProjectWriter (MappingManager *manager);
+    bool writeFile (QIODevice *device);
+
+  private:
+    void writeItem (Paint *item);
+    void writeItem (Mapping *item);
+    QXmlStreamWriter _xml;
+    MappingManager *_manager;
+};
diff --git a/Shape.h b/Shape.h
index e0d9770..259569a 100644
--- a/Shape.h
+++ b/Shape.h
@@ -28,6 +28,7 @@
  */
 struct Point
 {
+public:
   double x;
   double y;
   Point(double x_, double y_) : x(x_), y(y_) {}
@@ -64,6 +65,7 @@ public:
     vertices[i].x = x;
     vertices[i].y = y;
   }
+  virtual const char * getShapeType() = 0;
 };
 
 /**
@@ -81,6 +83,8 @@ public:
     vertices.push_back(p4);
   }
   virtual ~Quad() {}
+
+  virtual const char * getShapeType() { return "quad"; }
 };
 
 /**
@@ -97,6 +101,7 @@ public:
     vertices.push_back(p3);
   }
   virtual ~Triangle() {}
+  virtual const char * getShapeType() { return "triangle"; }
 };
 
 #endif /* SHAPE_H_ */
diff --git a/SourceGLCanvas.cpp b/SourceGLCanvas.cpp
index b2bb219..ff4ec78 100644
--- a/SourceGLCanvas.cpp
+++ b/SourceGLCanvas.cpp
@@ -2,6 +2,7 @@
  * SourceGLCanvas.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/Util.cpp b/Util.cpp
index 0e84cd2..78126e3 100644
--- a/Util.cpp
+++ b/Util.cpp
@@ -2,6 +2,7 @@
  * Util.cpp
  *
  * (c) 2013 Sofian Audry -- info(@)sofianaudry(.)com
+ * (c) 2013 Alexandre Quessy -- alexandre(@)quessy(.)net
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/libremapping.pro b/libremapping.pro
index 9a71e25..354cff5 100644
--- a/libremapping.pro
+++ b/libremapping.pro
@@ -1,8 +1,8 @@
 CONFIG  += qt debug
 TEMPLATE = app
-HEADERS  = MainWindow.h Util.h MapperGLCanvas.h SourceGLCanvas.h DestinationGLCanvas.h Mapper.h Mapping.h Shape.h Paint.h MappingManager.h
-SOURCES  = main.cpp MainWindow.cpp Util.cpp Mapper.cpp MapperGLCanvas.cpp SourceGLCanvas.cpp DestinationGLCanvas.cpp MappingManager.cpp
-QT      += gui opengl
+HEADERS  = MainWindow.h Util.h MapperGLCanvas.h SourceGLCanvas.h DestinationGLCanvas.h Mapper.h Mapping.h Shape.h Paint.h MappingManager.h ProjectWriter.h
+SOURCES  = main.cpp MainWindow.cpp Util.cpp Mapper.cpp MapperGLCanvas.cpp SourceGLCanvas.cpp DestinationGLCanvas.cpp MappingManager.cpp ProjectWriter.cpp
+QT      += gui opengl xml
 RESOURCES = libremapping.qrc
 
 docs.depends = $(HEADERS) $(SOURCES)