How to write tags and where to look for existing (non standard) ones?

[mamueller]

As a concrete project, I would like to extend the functionality of the documentation for R4 classes and methods a little bit, if only to document my own code.

Use cases are for example:

• a list of constructors for a certain class automatically linked to the class
• automatic links to methods that are documented separately both from the class and the generic
  ...
  From a first glance at the roxygen2 code I assume that writing my own 'tags' would be a fairly nonintrusive way to achieve this.
  If this is indeed the case it seems reasonable that other people had similar ideas and wrote their own tags. But I could not find any.
  Are there any resources about how to find or make one's own tags apart from the source code of the implemented tags?

Thanks for your time and the huge amount of work already done

[hadley]

There isn't currently, but I just filed an issue so we eventually write something about this: #882