code: public List<CmsUUID> getIdsOfAlreadyPublishedResources() {
  
          List<CmsUUID> alreadyPublished = new ArrayList<CmsUUID>();
          List<CmsPublishResource> allResources = new ArrayList<CmsPublishResource>();
          for (CmsPublishGroup group : m_groups) {
  
              for (CmsPublishResource resource : group.getResources()) {
                  allResources.add(resource);
                  for (CmsPublishResource related : resource.getRelated()) {
                      allResources.add(related);
                  }
              }
  
          }
          for (CmsPublishResource resource : allResources) {
              if ((resource.getInfo() != null) && (resource.getInfo().getType() == Type.PUBLISHED)) {
                  alreadyPublished.add(resource.getId());
              }
          }
          return alreadyPublished;
      }
docs: Returns the id's of all already published resources.<p>
  
  @return the id's of the already published resources