code: @Override
      public Item process(Context context, CachingOptions cachingOptions, Item item) throws ItemProcessingException {
          if (item.getDescriptorDom() != null) {
              includeDescriptors(context, cachingOptions, item);
          }
  
          return item;
      }
docs: Replaces special include tags found in a descriptor document with the document tree of descriptors specified in
  these include tags. If the include tag specifies a XPath query expression (through the select attribute), only
  the elements returned by the  query will be included.
  
  @throws org.craftercms.core.exception.ItemProcessingException if there was an error while trying to perform an
  include