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content/tech/spec/activitypub/tag.md
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@ -14,37 +14,6 @@ From <https://www.w3.org/TR/activitystreams-vocabulary/#dfn-tag>
{{<toc>}}
## Tagging Objects {#objects}
<p class="callout info">Not currently used in the fediverse.</p>
In theory, you could tag an Object to show that it is somehow referentially associated with the current Object.
An example application would be the Instagram or Facebook "tag a person in this image" feature, which might be implemented something like this:
```json
{
"id": "https://social.example/objects/e9c427d8-cef1-48bd-ab89-59a6df29673b",
"type": "Image",
"url": "https://cdn.social.example/1578798509203652608.jpg",
"tag": [
"https://facebook.com/users/1"
]
}
```
```json
{
"id": "https://facebook.com/users/1",
"type": "Person",
"name": "Mark Zuckerberg"
}
```
However, it might be better to stick to using [Mentions](#mention) as defined below.
Another example would be tagging a Note or an Article, but the semantic meaning of this is unclear, at least for most current social use-cases.
## Tagging Links {#links}
In practice, The primary usage of `tag` in most current implementations is to establish a microsyntax. Microsyntaxes are substrings of `name`, `summary`, and `content` that should be linked to or replaced by some rich entity.
@ -214,13 +183,42 @@ Consider the following Note:
}
```
## Tagging Objects {#objects}
In theory, you could tag an Object to show that it is somehow referentially associated with the current Object.
An example application would be the Instagram or Facebook "tag a person in this image" feature, which might be implemented something like this:
```json
{
"id": "https://social.example/objects/e9c427d8-cef1-48bd-ab89-59a6df29673b",
"type": "Image",
"url": "https://cdn.social.example/1578798509203652608.jpg",
"tag": [
"https://facebook.com/users/1"
]
}
```
```json
{
"id": "https://facebook.com/users/1",
"type": "Person",
"name": "Mark Zuckerberg"
}
```
However, it might be better to stick to using [Mentions](#mention) as defined below.
Another example would be tagging a Note or an Article, but the semantic meaning of this is unclear, at least for most current social use-cases.
### Emoji {#emoji}
<p class="callout warning">This is an extension type.</p>
See for more: <https://docs.joinmastodon.org/spec/activitypub/#emoji>
A sub-type of Link that refers to a `:custom_emoji:`, typically used for replacing a plain-text substring with an inline image (by implementations that do not otherwise support arbitrary inline images).
An object node that refers to a `:custom_emoji:`, typically used for replacing a plain-text substring with an inline image (by implementations that do not otherwise support arbitrary inline images).
#### Implementation details {#emoji-implementation}