# Generic tags zome

## User stories
- An agent should be able to tag any entry with any tag
- An agent should be able to query all existing tags
- An agent should be able to query which tags is an entry tagged with
- An agent should be able to query all the entires tagged with a certain tag

## Entry structure

This first anchor type is from [holochain_anchors](https://github.com/holochain/holochain_anchors)

Entry "anchor" {
    struct Anchor {
        anchor_type: String,
        anchor_text: Option<String>
    }
    Links: {
        anchor->entry
        entry->anchor
    }
}

> All anchors will be created like this:
> ```rust
> {
> anchor_type: "tag",
> anchor_text: "<ACTUAL_TAG>",
> }
> ```

## Entry relationship diagram

graph TD
  subgraph tags zome
    subgraph anchors
      all_tags-->science
      all_tags-->religion
    end
    subgraph posts
      science-->post1
      post1-->science
    end
  end

> posts is only an example: links could go to any holochain entry

## Validation

### Entries

* `anchors`:
* Create is valid always
* Update or Delete is not valid

### Links
* `anchor->entry` & `entry->anchor`:
* AddLink: always valid valid
* RemoveLink only valid if the author of the AddLink is the one removing the link