--- a/src/main/java/de/mpiwg/itgroup/annotations/Actor.java	Thu Feb 09 20:46:15 2017 +0100
+++ b/src/main/java/de/mpiwg/itgroup/annotations/Actor.java	Thu Feb 09 21:17:04 2017 +0100
@@ -54,7 +54,7 @@
     public boolean isEquivalentWith(Person person, AnnotationStore store) {
         if (person == null) return false;
         if (person.equals(this)) return true;
-        if (person.getIdString().equals(this.getIdString())) return true;
+        if (person.getIdString().equalsIgnoreCase(this.getIdString())) return true;
         if (isGroup() && store != null) {
             // check if person in group
             if (person.groups != null) {
@@ -148,6 +148,10 @@
         if (uri != null && uri.startsWith(prefix)) {
             id = uri.replace(prefix, "");
         }
+        if (id == null && uri != null) {
+        	// accept uri without prefix
+        	id = uri;
+        }
         return id;
     }