diff -r 3360c3f7fb18 -r 7722ec70c01b client/js/model.js
--- a/client/js/model.js	Thu Jul 26 18:06:05 2012 +0200
+++ b/client/js/model.js	Fri Jul 27 12:22:10 2012 +0200
@@ -7,7 +7,6 @@
         this.title = _props.title || "(untitled " + this.type + ")";
         this.description = _props.description || "";
         this.uri = _props.uri || "";
-//        this._backRefs = [];
     }
 }
 
@@ -17,6 +16,24 @@
     this[ _propName ] = _element;
 }
 
+Rkns.Model._BaseElement.prototype.updateGraphics = function() {
+    this._project._renderer.redraw();
+}
+
+Rkns.Model._BaseElement.prototype.updateData = function() {
+}
+
+Rkns.Model._BaseElement.prototype.propagateChanges = function(_from) {
+    switch(_from) {
+        case Rkns._FROM_GRAPHICS:
+            this.updateData();
+        break;
+        case Rkns._FROM_DATA:
+            this.updateGraphics();
+        break;
+    }
+}
+
 /* Element Class Generator */
 
 Rkns.Model._elementClass = function(_type) {
@@ -42,6 +59,26 @@
     this.position = _props.position;
 }
 
+Rkns.Model.Node.prototype.setPosition = function(_from, _x, _y) {
+    if (typeof _x === "object") {
+        if (typeof _x.x !== "undefined" && typeof _x.y !== "undefined") {
+            this.position.x = _x.x;
+            this.position.y = _x.y;
+        } else {
+            if (typeof _x.length !== "undefined") {
+                this.position.x = _x[0];
+                this.position.y = _x[1];
+            }
+        }
+    } else {
+        if (typeof _y !== "undefined") {
+            this.position.x = +_x;
+            this.position.y = +_y;
+        }
+    }
+    this.propagateChanges(_from);
+}
+
 /* Edge Model */
 
 Rkns.Model.Edge = Rkns.Model._elementClass("edge");