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nips/e-and-p-tags.md
Robert C. Martin 39c7f54db6 mend
2022-05-04 12:00:51 -05:00

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On 'e' and 'p' tags in Text Events (kind 1).

A recommendation for clients.

The following seems to be the conventions that are used by Branle, Damus, and more-speech for referencing events and authors when building a reply. These conventions help clients build event threads, and alert authors of replies.

Definitions:

  • A reply chain is the list of events from the root event to a specific reply.
  • A reply thread is the tree of events consisting of all replies beginning at the root.
  • An event id is a 32 byte number in lower-case hexidecimal.

The 'e' tag

Used in a text event contains a single event id. ["e", "~hex number~"]

  • No 'e' tag: This event is not a reply to, nor does it refer to, any other event.

  • One 'e' tag: ["e",id]: The id of the event to which this event is a reply.

  • Two 'e' tags: ["e",root-id], ["e",reply-id] 'root-id' is the id of the event at the root of the reply chain. 'reply-id' is the id of the article to which this event is a reply.

  • Many 'e' tags: ["e",root-id] ["e",mention-id], ..., ["e",reply-id] There may be any number of 'mention-ids'. These are the ids of events which may, or may not be in the reply chain. They are citings from this event. 'root-id' and 'reply-id' are as above.

The 'p' tag

Used in a text event contains a list of pubkeys used to record who is involved in a reply thread.

When replying to a text event E with 'p' tags P, the replying event's 'p' tags should contain P as well as the pubkey of the of the event being replied to.

Example: Given a text event authored by a1 with p tags [p1, p2, p3] then the p tags of the reply should be [a1, p1, p2, p3] in no particular order.