methods should be generalized

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

@@ -550,7 +550,7 @@ public interface Model {
 
   public void addAuthor(Author author);
 
-  void addAuthors(Set<Author> authorsFromRdf);
+  void addAuthors(Collection<Author> authorsFromRdf);
 
   public List<Author> getAuthors();
 
@@ -562,7 +562,7 @@ public interface Model {
 
   public List<Calendar> getModificationDates();
 
-  void addModificationDates(List<Calendar> modificationDatesFromRdf);
+  void addModificationDates(Collection<Calendar> modificationDatesFromRdf);
 
 
 }

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

@@ -721,14 +721,14 @@ public class ModelFullIndexed implements Model {
   }
 
   @Override
-  public void addAuthors(Set<Author> authors) {
+  public void addAuthors(Collection<Author> authors) {
     for (Author author : authors) {
       addAuthor(author);
     }
   }
 
   @Override
-  public void addModificationDates(List<Calendar> modificationDates) {
+  public void addModificationDates(Collection<Calendar> modificationDates) {
     for (Calendar calendar : modificationDates) {
       addModificationDate(calendar);
     }