diff -r f2c2c80a49f7 -r 5d2621f71f39 server/src/app/Models/GeoResource.php
--- a/server/src/app/Models/GeoResource.php	Thu Sep 22 15:34:10 2016 +0200
+++ b/server/src/app/Models/GeoResource.php	Thu Sep 22 15:42:12 2016 +0200
@@ -1,6 +1,7 @@
 <?php
 namespace CorpusParole\Models;
 
+use CorpusParole\Libraries\CorpusParoleException;
 use CorpusParole\Libraries\RdfModel\RdfModelResource;
 use CorpusParole\Libraries\Utils;
 use JsonSerializable;
@@ -10,16 +11,36 @@
  */
 class GeoResource extends RdfModelResource implements JsonSerializable {
 
-    public function __construct($uri, $graph) {
+    public function __construct($uri, $graph, $providedCHO) {
         parent::__construct($uri, $graph);
+        $this->providedCHO = $providedCHO;
+        $this->readOnly = true;
+        $this->changePending = false;
+        $this->needDelete = false;
     }
 
+    private $providedCHO = null;
+    private $readOnly = true;
+    private $changePending = false;
+    private $needDelete = false;
+
     private $refLocs = null;
     private $notes = null;
+    private $latitude = false;
+    private $longitude = false;
+
+    public function getDeltaList() {
+        if($this->changePending) {
+            throw new CorpusParoleException('GetDeltaList called when changes are pending');
+        }
+        return parent::getDeltaList();
+    }
 
     public function clearMemoizationCache() {
         $this->refLocs = null;
         $this->notes = null;
+        $this->latitude = false;
+        $this->longitude = false;
     }
 
     public function getRefLocs() {
@@ -30,6 +51,21 @@
         return $this->refLocs;
     }
 
+    public function setRefLocs($refLocs) {
+        if(!$this->changePending) {
+            throw new CorpusParoleException('Can call setRefLocs only when changes are pending');
+        }
+
+        $this->delete("<http://www.w3.org/2002/07/owl#sameAs>");
+
+        foreach($refLocs as $refLocUri) {
+            $this->addResource("http://www.w3.org/2002/07/owl#sameAs", $refLocUri);
+        }
+
+        $this->clearMemoizationCache();
+
+    }
+
     public function getNotes() {
         if(is_null($this->notes)) {
             $this->notes = $this->all('<http://www.w3.org/2004/02/skos/core#note>');
@@ -37,6 +73,40 @@
         return $this->notes;
     }
 
+    public function getLatitude() {
+        if($this->latitude === false) {
+            try {
+                $this->latitude = $this->getLiteral('<http://www.w3.org/2003/01/geo/wgs84_pos#lat>');
+            } catch(\Exception $e) {
+                $this->latitude = null;
+            }
+        }
+        return $this->latitude;
+    }
+
+    public function getLatitudeValue() {
+        $lat = $this->getLatitude();
+        return is_null($lat)?null:$lat->getValue();
+    }
+
+    public function getLongitude() {
+        if($this->longitude === false) {
+            try {
+                $this->longitude = $this->getLiteral('<http://www.w3.org/2003/01/geo/wgs84_pos#long>');
+            } catch(\Exception $e) {
+                $this->longitude = null;
+            }
+        }
+        return $this->longitude;
+    }
+
+    public function getLongitudeValue() {
+        $long = $this->getLongitude();
+        return is_null($long)?null:$long->getValue();
+    }
+
+
+
     public function jsonSerialize() {
         $notes = array_map(
             function($note) { return Utils::processLiteralResourceOrString($note); },
@@ -44,8 +114,65 @@
         );
         return [
             'ref-locs' => $this->getRefLocs(),
-            'notes' => $notes
+            'notes' => $notes,
+            'latitude' => $this->getLatitudeValue(),
+            'longitude' => $this->getLongitudeValue(),
         ];
     }
 
+    public function setReadOnly($ro) {
+        if($this->readOnly and !$ro) {
+            $this->changePending = true;
+        }
+        $this->readOnly = $ro;
+    }
+
+    public function setNeedDelete($nd) {
+        $this->needDelete = $nd;
+    }
+
+    public function rollback() {
+        $this->changePending = false;
+    }
+
+    public function commit() {
+
+        // Do nothing if there is no change pending
+        if(!$this->changePending) {
+            return;
+        }
+
+        $delta = $this->startDelta();
+
+        //delete the previous blank node
+        if($this->needDelete) {
+            $delta->addDeleteWhere(
+                "?s ?p ?o. ".
+                "{ ".
+                "    ?_ <http://purl.org/dc/terms/spatial> ?s. ".
+                "} ".
+                "UNION { ".
+                "    ?s <http://purl.org/dc/terms/spatial> ?o ".
+                "}"
+            );
+        }
+
+        // add the node
+        $geoinfoNodeAdded = $delta->getAddedGraph()->newBNode("http://www.europeana.eu/schemas/edm/Place");
+        $delta->getAddedGraph()->add($this->providedCHO, "http://purl.org/dc/terms/spatial", $geoinfoNodeAdded);
+
+        foreach($this->propertyUris() as $prop) {
+            if($prop == "http://www.w3.org/1999/02/22-rdf-syntax-ns#type") {
+                continue;
+            }
+            foreach($this->all("<$prop>") as $propVal) {
+                $delta->getAddedGraph()->add($geoinfoNodeAdded, $prop, $propVal);
+            }
+        }
+
+        $this->changePending = false;
+
+    }
+
+
 }
\ No newline at end of file