interface uses broader class

model/src/main/java/lcsb/mapviewer/model/map/model/Model.java

@@ -151,7 +151,7 @@ public interface Model {
    * @param elements
    *          list of elements
    */
-  void addElements(List<? extends Element> elements);
+  void addElements(Collection<? extends Element> elements);
 
   /**
    * Sets new short description of the model.

model/src/main/java/lcsb/mapviewer/model/map/model/ModelFullIndexed.java

@@ -198,7 +198,7 @@ public class ModelFullIndexed implements Model {
   }
 
   @Override
-  public void addElements(List<? extends Element> elements) {
+  public void addElements(Collection<? extends Element> elements) {
     for (Element element : elements) {
       addElement(element);
     }