code: @Override
      public Set<Node> findUsers(final String uid) {
          QueryBuilder qb = new LdapQueryBuilder();
          if ("*".equals(uid)) {
              qb.append(LdapKeys.OBJECT_CLASS, userObjectClass);
          } else {
              qb.append(LdapKeys.OBJECT_CLASS, userObjectClass);
              qb.append(userIdentifyer, uid + "*");
          }
          return findUsers(qb);
      }
docs: Returns several LDAP-Users for a given search-String.
  
  @param uid the uid or part of uid of the Users.
  @return Users as a Set of com.innoq.liqid.model.Node.