code: public static PublishNotify createPublishNotify(Identifier i1, Document md) {
  		return createPublishNotify(i1, null, md);
  	}
docs: Create a new {@link PublishNotify} instance that is used to publish
  metadata to an {@link Identifier}.
  
  @param i1 the {@link Identifier} to which the given metadata is published to
  @param md the metadata that shall be published
  @return the new {@link PublishNotify} instance