code: @Override
      public Map<URI, MatchResult> findServicesClassifiedByAll(Set<URI> modelReferences) {
          return findServicesClassifiedByAll(modelReferences, LogicConceptMatchType.Subsume);
      }
docs: Discover the services that are classified by all the types given. That is, all those that have some level of
  matching with respect to all services provided in the model references.
  
  @param modelReferences the classifications to match against
  @return a Set containing all the matching services. If there are no solutions, the Set should be empty, not null.