The has_reply property links an Item to other follow-up content Items made on the same topic. Use of this property can result in a single branch of replies from the original Item, or in a tree-like structure with branches forking at different Items along the way.

For example, in Forums such as mailing lists, message boards, etc., has_reply will be used to link a starter Post to any Post that is made in response to the original message. Also, has_reply can be used to connect any type of content Item (images, videos, etc.) to any Item or text Post that is made in response.