diff --git a/glsk/glsk-document-cim/src/main/java/com/powsybl/glsk/cim/CimGlskRegisteredResource.java b/glsk/glsk-document-cim/src/main/java/com/powsybl/glsk/cim/CimGlskRegisteredResource.java
index dd66c525..2be0e89a 100644
--- a/glsk/glsk-document-cim/src/main/java/com/powsybl/glsk/cim/CimGlskRegisteredResource.java
+++ b/glsk/glsk-document-cim/src/main/java/com/powsybl/glsk/cim/CimGlskRegisteredResource.java
@@ -19,14 +19,24 @@ public class CimGlskRegisteredResource extends AbstractGlskRegisteredResource {
 
     public CimGlskRegisteredResource(Element element) {
         Objects.requireNonNull(element);
-        this.mRID = element.getElementsByTagName("mRID").item(0).getTextContent();
+        this.mRID = removeRdfPrefix(element.getElementsByTagName("mRID").item(0).getTextContent());
         this.name = element.getElementsByTagName("name").item(0).getTextContent();
         this.participationFactor = getContentAsDoubleOrNull(element, "sK_ResourceCapacity.defaultCapacity");
         this.maximumCapacity = getContentAsDoubleOrNull(element, "resourceCapacity.maximumCapacity");
         this.minimumCapacity = getContentAsDoubleOrNull(element, "resourceCapacity.minimumCapacity");
     }
 
-    private Double getContentAsDoubleOrNull(Element baseElement, String tag) {
+    private static String removeRdfPrefix(String s) {
+        String s1 = s;
+        // rdf:ID is the mRID plus an underscore added at the beginning of the string
+        // We may decide if we want to preserve or not the underscore
+        if (s1.length() > 0 && s1.charAt(0) == '_') {
+            s1 = s1.substring(1);
+        }
+        return s1;
+    }
+
+    private static Double getContentAsDoubleOrNull(Element baseElement, String tag) {
         return baseElement.getElementsByTagName(tag).getLength() == 0 ? null :
                 Double.parseDouble(baseElement.getElementsByTagName(tag).item(0).getTextContent());
     }