diff --git a/owlps-positioning/Makefile b/owlps-positioning/Makefile
index 0e02bb2..09aaef1 100644
--- a/owlps-positioning/Makefile
+++ b/owlps-positioning/Makefile
@@ -133,6 +133,8 @@ $(OBJ_DIR)/%.o: $(SRC_DIR)/%.cc $(SRC_DIR)/%.hh
 	$(LD) $(LDFLAGS) -o $@ $^
 
 # Dependencies
+$(OBJ_DIR)/point3d.o: \
+	$(OBJ_DIR)/posexcept.o
 $(OBJ_DIR)/posutil.o: \
 	$(OBJ_DIR)/posexcept.o
 $(OBJ_DIR)/owlps-positioning.o: \
diff --git a/owlps-positioning/src/point3d.cc b/owlps-positioning/src/point3d.cc
index aff35bf..bde831b 100644
--- a/owlps-positioning/src/point3d.cc
+++ b/owlps-positioning/src/point3d.cc
@@ -1,8 +1,33 @@
 #include "point3d.hh"
+#include "posexcept.hh"
 
 #include <sstream>
 #include <boost/functional/hash.hpp>
 
+using namespace std ;
+
+
+
+/* *** Constructors *** */
+
+
+Point3D::Point3D(const string &source)
+{
+  float pos[3] ;
+  istringstream iss(source) ;
+
+  for (int i = 0 ; i < 2 ; ++i)
+    {
+      iss >> pos[i] ;
+      if (iss.get() != ';')
+        throw malformed_input_data(
+          "Point3D(string): cannot extract coordinates!") ;
+    }
+  iss >> pos[2] ;
+
+  set_coordinates(pos) ;
+}
+
 
 
 /* *** Distance operations *** */
@@ -84,16 +109,16 @@ bool Point3D::operator<(const Point3D &source) const
 }
 
 
-Point3D::operator std::string(void) const
+Point3D::operator string(void) const
 {
-  std::ostringstream oss ;
+  ostringstream oss ;
   oss << *this ;
   return oss.str() ;
 }
 
 
 
-std::ostream& operator<<(std::ostream &os, const Point3D &p)
+ostream& operator<<(ostream &os, const Point3D &p)
 {
   os << "(" << p.x << ";" << p.y << ";" << p.z << ")" ;
   return os ;
diff --git a/owlps-positioning/src/point3d.hh b/owlps-positioning/src/point3d.hh
index f3f5652..c1a4751 100644
--- a/owlps-positioning/src/point3d.hh
+++ b/owlps-positioning/src/point3d.hh
@@ -1,6 +1,7 @@
 #ifndef _OWLPS_POSITIONING_POINT3D_HH_
 #define _OWLPS_POSITIONING_POINT3D_HH_
 
+#include <string>
 #include <ostream>
 #include <cmath>
 
@@ -22,6 +23,8 @@ public:
   Point3D(const float source[3]):
     x(source[0]), y(source[1]), z(source[2]) {}
 
+  Point3D(const std::string &source) ;
+
   virtual ~Point3D(void) {}
 
   /** @name Read accessors */