code: private List<String> getProjectResources() {
  
          if (m_projectResources == null) {
              try {
                  m_projectResources = getCms().readProjectResources(getReferenceProject());
              } catch (Throwable e) {
                  LOG.error(e.getLocalizedMessage(), e);
                  // use an empty list (all resources are "outside")
                  m_projectResources = new ArrayList<String>();
              }
          }
          return m_projectResources;
      }
docs: Returns the reference project resources.<p>
  
  @return the reference project resources