code: public void add(String resource, Map<String, String[]> parameters, Map<String, Object> attrs) {
  
          if (m_completed) {
              return;
          }
          if (m_redirectTarget == null) {
              // Add only if not already redirected
              m_elements.add(resource);
              m_byteSize += CmsMemoryMonitor.getMemorySize(resource);
              if (parameters == null) {
                  parameters = Collections.emptyMap();
              }
              m_elements.add(parameters);
              m_byteSize += CmsMemoryMonitor.getValueSize(parameters);
              if (attrs == null) {
                  attrs = Collections.emptyMap();
              }
              m_elements.add(attrs);
              m_byteSize += CmsMemoryMonitor.getValueSize(attrs);
          }
      }
docs: Add an include - call target resource to this cache entry.<p>
  
  @param resource a name of a resource in the OpenCms VFS
  @param parameters a map of parameters specific to this include call
  @param attrs a map of request attributes specific to this include call