# `JSONSchex.Draft202012.Vocabulary`
[🔗](https://github.com/xinz/jsonschex/blob/main/lib/jsonschex/draft202012/vocabulary.ex#L1)

Maps JSON Schema keywords to their Draft 2020-12 vocabulary URIs and defines
both the full supported vocabulary set and the built-in Draft 2020-12 default
active vocabulary set.

Used by `JSONSchex.Compiler` to check whether a keyword is allowed based on the
active vocabulary set, and to resolve `$vocabulary` declarations.

## Examples

    iex> JSONSchex.Draft202012.Vocabulary.keyword("type")
    "https://json-schema.org/draft/2020-12/vocab/validation"

    iex> JSONSchex.Draft202012.Vocabulary.keyword("properties")
    "https://json-schema.org/draft/2020-12/vocab/applicator"

    iex> JSONSchex.Draft202012.Vocabulary.keyword("unknown")
    nil

# `defaults`

```elixir
@spec defaults() :: list()
```

Returns the full list of vocabularies supported by JSONSchex.

This is the implementation capability set used when validating required
`$vocabulary` declarations.

# `draft2020_12_defaults`

```elixir
@spec draft2020_12_defaults() :: list()
```

Returns the built-in default active vocabularies for the standard Draft 2020-12
dialect.

This excludes `format-assertion`, which is not enabled by default for the
standard Draft 2020-12 dialect.

# `format_annotation`

Returns the format-annotation vocabulary URI.

# `format_assertion`

Returns the format-assertion vocabulary URI.

# `keyword`

Returns the vocabulary URI for a given JSON Schema keyword, or `nil` if unknown.

---

*Consult [api-reference.md](api-reference.md) for complete listing*