A reply (or comment) is a kind of post that is a text (typically, though photos are possible too) response to some other post, that makes little or no sense without reading or at least knowing the context of the source post.
I’d promised to do a quick outline for the kind gang at Hypothes.is to outline how to make their product could be a bit more open and support some additional web standards to make it more IndieWeb friendly as well as to work toward supporting the Webmention protocol to send notifications of annotations on a page. A few weeks ago at IndieWebCamp New Haven I decided to finally sketch out some of the pieces which should be relatively easy for them to implement into the product. Below are some of the recommendations and some examples of what needs to be done to implement them into their platform to allow it to better interact with other content on the web. This post is in reply to a few prior conversations about Webmention, but primarily pertains to Microformats which will help in creating those.    
To my knowledge Hypothes.is generates a hash for each annotation it has in the system and generates two separate, but related URLs for them. As an example, here are the two URLs for a response Jon Udell made on my website recently:
The first URL is where a stand-alone copy of the annotation lives on the web, separate from the content it is related to. The second URL resolves to the page on which the annotation was made and both will automatically open up Hypothesis’ side drawer UI to the annotation in question and will–on most browsers–auto-scroll down the page to show the point at which the annotation was made. Essentially this second URL shows the annotation in-situ in conjunction with the Hypothes.is user interface. I’ll note that they can also have some human readable trailing data in the URL that indicates the site on which the annotation was made like so:
https://hyp.is/_tLJyA-cEemE-qPndyfQow/boffosocko.com/?p=55708991. However, in practice, one could remove or replace the boffosocko.com and trailing portion with any other URL and the correct page will still resolve.
- Add the appropriate microformats classes on those pages;
- Add the canonical URL for the page on which the annotation is in reference to either instead of or in addition to the Hypothes.is prefixed URL which already appears on these pages. Webmention functioning properly will require this canonical URL to exist on the page to be able to send notifications and have them be received properly.
These things would make these pages more easily and usefully parseable on the open web. If/when Hypothes.is may support Webmention (aka web notifications) then all of these prerequisite pieces will already be in place. In the erstwhile, even without Hypothes.is running code to support sending Webmentions, users could force manual Webmentions using services like Telegraph, mention-tech.appspot, or even personal endpoints generated on individual posts (see the one below) or on custom endpoint pages like mine on WordPress. Aaron Parecki’s article Sending your First Webmention from Scratch is a useful tutorial for those with little experience with Microformats or Webmention.
Types of Annotations and Microformats Markup
To my knowledge there are three distinct types of annotations that might occur which may need slightly different microformats mark up depending on the type. These are:
- Unassigned page notes (or sometimes orphaned page notes): For all intents and purposes are the equivalent of bookmarks (and are used this way by many) though they go by a different name within the service.
- Highlights of particular passages: In IndieWeb parlance, these are roughly equivalent to quotations of content.
- Highlights and annotations of particular passages: In IndieWeb terms these again are quotes of content which also have what might be considered a reply or comment to that segment of quoted text. Alternately the annotation itself might be considered a note related to what was highlighted, but I suspect from a UI and semantic viewpoint, treating these as replies is probably more apropos in the majority of cases.
Each of these can obviously have one or more potential tags as well. Some of the examples below include the
p-category microformats for how these would logically appear. Using the example URL above and several others for the other cases, I’ll provide some example HTML with proper microformats classes to make doing the mark up easier. I’ve created some minimal versions of text and mark up, though Hypothes.is obviously includes much more HTML (and a variety of divs for CSS purposes. While some of the mark up is a bit wonky, particularly with respect to adding the hyp.is and the original posts’ canonical URLs, it could be somewhat better with some additional reworking of the presentation, but I wanted to change as little as possible of their present UI. For the minimal examples, I’ve stripped out the native Hypothes.is classes and only included the semantic microformats. Because microformats are only meant for semantic mark up, the developers should keep in mind it is good practice NOT to use these classes for CSS styling.
Page note with no annotations (bookmarks)
Example from https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow (but without the annotation portion)
<div class="h-entry"> <a class="p-author h-card" href="https://hypothes.is/users/judell">judell</a> Public on <https://hyp.is/_tLJyA-cEemE-qPndyfQow/boffosocko.com/?p=55708991>"Chris Aldrich on the IndieWeb"</a> (<a class="u-bookmark-of" href="https://boffosocko.com/?p=55708991">boffosocko.com</a>) <time class="dt-published" datetime="2019-01-11 18:052:00" title="Friday, Jan 11, 2019, 6:52 PM"><a href="https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow" target="_blank" rel="noopener">Jan 11</a></time> <div class="p-category">tag-name1</div> <div class="p-category">tag-name2</div> <div class="p-category">tag-name3</div> </div>
Page note with an annotation
(aka a reply, but could alternately be marked up as above as a bookmark) Example from https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow
<div class="h-entry"> <a class="p-author h-card" href="https://hypothes.is/users/judell">judell</a> Public on <https://hyp.is/_tLJyA-cEemE-qPndyfQow/boffosocko.com/?p=55708991>"Chris Aldrich on the IndieWeb"</a> (<a class="u-in-reply-to" href="https://boffosocko.com/?p=55708991">boffosocko.com</a>) <time class="dt-published" datetime="2019-01-11 18:052:00" title="Friday, Jan 11, 2019, 6:52 PM"><a href="https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow" target="_blank" rel="noopener">Jan 11</a></time> <div class="e-content"> <p>This is web thinking in action.</p> <p>https://blog.jonudell.net/2011/01/24/seven-ways-to-think-like-the-web/</p> <p>Well done!</p> </div> <div class="p-category">tag-name</div> </div>
Highlights (aka quotes)
Example from https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow
<div class="h-entry"> <a class="p-author h-card" href="https://hypothes.is/users/judell">judell</a> Public on <a href="https://hyp.is/gBZPQucmEeaPBQvYzSRo-Q/www.theatlantic.com/magazine/archive/1945/07/as-we-may-think/303881/">"As We May Think"</a> (<a class="u-quotation-of h-cite" href="https://www.theatlantic.com/magazine/archive/1945/07/as-we-may-think/303881/">www.theatlantic.com</a>) <time class="dt-published" datetime="2017-04-30 08:40:00" title="Sunday, Apr 30, 2017, 08:40 AM"><a href="https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow" target="_blank" rel="noopener">Apr 30, 2017</a></time> <blockquote>First he runs through an encyclopedia, finds an interesting but sketchy article, leaves it projected. Next, in a history, he finds another pertinent item, and ties the two together.</blockquote> <div class="p-category">IAnnotate2017</div> </div>
Example from https://hypothes.is/a/9JrX5lf9RraeLKKn9WwmMQ
<div class="h-entry"> <a class="p-author h-card" href="https://hypothes.is/users/jeremydean">jeremydean</a> Public on <a href="https://hyp.is/9JrX5lf9RraeLKKn9WwmMQ/www.theatlantic.com/magazine/archive/1945/07/as-we-may-think/303881/">"As We May Think"</a> (<a class="u-in-reply-to" href="https://www.theatlantic.com/magazine/archive/1945/07/as-we-may-think/303881/">www.theatlantic.com</a>) <time class="dt-published" datetime="2015-09-02 15:11:00" title="Wednesday, Sep 2, 2015, 03:11 PM"><a href="https://hypothes.is/a/_tLJyA-cEemE-qPndyfQow" target="_blank" rel="noopener">Sep 2, 2015</a></time> <blockquote class="p-in-reply-to h-cite">This has not been a scientist's war; it has been a war in which all have had a part. <blockquote> <div class="e-content"> <p>It kind of blows me mind that the end of WWII is the context for these early dreams of the Internet. Is it the hope experienced in patriotic collaboration toward technological innovation? That's what Bush seems to acknowledge explicitly. It's a techno-militaristic union that haunts us to this day (#prism). But I wonder too if it's the precarious of knowledge, or perhaps the destructiveness of knowledge, that also inspires Bush…</p> </div> <div class="p-category">tag-name</div> </div>
I’ll also note that there’s the potential of a reply on Hypothes.is to a prior reply to a canonical URL source. In that case it could be either marked up as a reply to the “parent” on Hypothesis and/or a reply to the canonical source URL, or even both so that webmentions could be sent further upstream. (My experience in this is more limited, not having dealt with it personally in the past.) Once these pieces are implemented, they can be tested against a variety of microformats parsers to ensure they’re outputting the correct (and properly nested) information. I often find that pin13 is a pretty solid modern and up-to-date choice for this.
Additional resources with examples
I’ll also leave the caveat here, that while I’ve got a stronger grasp of Microformats than the average bear, that the above examples may have some subtle quirks that others may catch or which could be improved upon. I find that the Microformats web chat can be a good source for helps from some of the world’s best experts in the area. (Other methods for engaging in chat via IRC, Slack, etc. can be utilized as well.)
If Dan, Jon, or any of the gang has questions about any of this, I’m happy to chat via phone, video conference, or other to help get them going.