code: protected HalRepresentation withEmbedded(final String rel, final List<? extends HalRepresentation> embeddedItems) {
          embedded = copyOf(embedded).with(rel, embeddedItems).using(curies).build();
          return this;
      }
docs: Adds embedded items for a link-relation type to the HalRepresentation.
  <p>
  If {@code rel} is already present, it is replaced by the new embedded items.
  </p>
  
  @param rel the link-relation type of the embedded items that are added or replaced
  @param embeddedItems the new values for the specified link-relation type
  @return this
  @since 0.5.0