# Domains

The `Domain` defines the universe in which your assistant operates. It specifies the `intents`, `entities`, `slots`, and `actions` your bot should know about. Optionally, it can also include `templates` for the things your bot can say.

- [An example of a Domain](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#an-example-of-a-domain)
- [Custom Actions and Slots](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#custom-actions-and-slots)
- [Utterance templates](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#utterance-templates)
- [Images and Buttons](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#images-and-buttons)
- [Custom Output Payloads](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#custom-output-payloads)
- [Channel-Specific Utterances](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#channel-specific-utterances)
- [Variables](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#variables)
- [Variations](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#variations)
- [Ignoring entities for certain intents](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#ignoring-entities-for-certain-intents)

## [An example of a Domain](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id2)

As an example, the `DefaultDomain` has the following yaml definition:

```yaml
intents:
  - greet
  - goodbye
  - affirm
  - deny
  - mood_great
  - mood_unhappy
  - bot_challenge

actions:
- utter_greet
- utter_cheer_up
- utter_did_that_help
- utter_happy
- utter_goodbye
- utter_iamabot

templates:
  utter_greet:
  - text: "Hey! How are you?"

utter_cheer_up:
  - text: "Here is something to cheer you up:"
    image: "https://i.imgur.com/nGF1K8f.jpg"

utter_did_that_help:
  - text: "Did that help you?"

utter_happy:
  - text: "Great, carry on!"

utter_goodbye:
  - text: "Bye"

utter_iamabot:
  - text: "I am a bot, powered by Rasa."
```

**What does this mean?**

Your NLU model will define the `intents` and `entities` that you need to include in the domain.

[Slots](https://legacy-docs-v1.rasa.com/1.3.10/core/slots/#slots) hold information you want to keep track of during a conversation. A categorical slot called `risk_level` would be defined like this:

```yaml
slots:
   risk_level:
      type: categorical
      values:
      - low
      - medium
      - high
```

[Here](https://legacy-docs-v1.rasa.com/1.3.10/core/slots/#slot-classes) you can find the full list of slot types defined by Rasa Core, along with syntax for including them in your domain file.

[Actions](https://legacy-docs-v1.rasa.com/1.3.10/core/actions/#actions) are the things your bot can actually do. For example, an action could:

- respond to a user,
- make an external API call,
- query a database, or
- just about anything!

## [Custom Actions and Slots](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id3)

To reference slots in your domain, you need to reference them by their **module path**. To reference custom actions, use their **name**. For example, if you have a module called `my_actions` containing a class `MyAwesomeAction`, and module `my_slots` containing `MyAwesomeSlot`, you would add these lines to the domain file:

```yaml
actions:
  - my_custom_action
  ...

slots:
  - my_slots.MyAwesomeSlot
```

The `name` function of `MyAwesomeAction` needs to return `my_custom_action` in this example (for more details, see [Custom Actions](https://legacy-docs-v1.rasa.com/1.3.10/core/actions/#custom-actions)).

## [Utterance templates](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id4)

Utterance templates are messages the bot will send back to the user. There are two ways to use these templates:

1. If the name of the template starts with `utter_`, the utterance can directly be used as an action. You would add the utterance template to the domain:

```yaml
templates:
     utter_greet:
  - text: "Hey! How are you?"
```

Afterwards, you can use the template as an action in the stories:

```yaml
## greet the user
* intent_greet
  - utter_greet
```

When `utter_greet` is run as an action, it will send the message from the template back to the user.

2. You can use the templates to generate response messages from your custom actions using the dispatcher:
`dispatcher.utter_template("utter_greet", tracker)`. This allows you to separate the logic of generating the messages from the actual copy. In you custom action code, you can send a message based on the template like this:

```python
from rasa_sdk.actions import Action

class ActionGreet(Action):
     def name(self):
         return 'action_greet'

def run(self, dispatcher, tracker, domain):
         dispatcher.utter_template("utter_greet", tracker)
         return []
```

## [Images and Buttons](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id5)

Templates defined in a domain’s yaml file can contain images and buttons as well:

```yaml
templates:
  utter_greet:
  - text: "Hey! How are you?"
    buttons:
    - title: "great"
      payload: "great"
    - title: "super sad"
      payload: "super sad"
  utter_cheer_up:
  - text: "Here is something to cheer you up:"
    image: "https://i.imgur.com/nGF1K8f.jpg"
```

Note

Please keep in mind that it is up to the implementation of the output channel on how to display the defined buttons. The command line, for example, can’t display buttons or images, but tries to mimic them by printing the options.

## [Custom Output Payloads](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id6)

You can also send any arbitrary output to the output channel using the `custom:` key. Note that since the domain is in yaml format, the json payload should first be converted to yaml format.

For example, although date pickers are not a defined parameter in utterance templates because they are not supported by most channels, a Slack date picker can be sent like so:

```yaml
templates:
  utter_take_bet:
  - custom:
      blocks:
      - type: section
        text:
          text: "Make a bet on when the world will end:"
          type: mrkdwn
        accessory:
          type: datepicker
          initial_date: '2019-05-21'
          placeholder:
            type: plain_text
            text: Select a date
```

## [Channel-Specific Utterances](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id7)

If you have certain utterances that you would like sent only to specific channels, you can specify this with the `channel:` key. The value should match the name defined in the `name()` method of the channel’s `OutputChannel` class. Channel-specific utterances are especially useful if creating custom output payloads that will only work in certain channels.

```yaml
templates:
  utter_ask_game:
  - text: "Which game would you like to play?"
    channel: "slack"
    custom:
      - # payload for Slack dropdown menu to choose a game
  - text: "Which game would you like to play?"
    buttons:
    - title: "Chess"
      payload: '/inform{"game": "chess"}'
    - title: "Checkers"
      payload: '/inform{"game": "checkers"}'
    - title: "Fortnite"
      payload: '/inform{"game": "fortnite"}'
```

Each time your bot looks for utterances, it will first check to see if there are any channel-specific templates for the connected channel. If there are, it will choose **only** from these utterances. If no channel-specific templates are found, it will choose from any utterances that do not have a defined `channel`. Therefore, it is good practice to always have at least one template for each utterance that has no `channel` specified so that your bot can respond in all environments, including in the shell and in interactive learning.

## [Variables](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id8)

You can also use **variables** in your templates to insert information collected during the dialogue. You can either do that in your custom python code or by using the automatic slot filling mechanism. For example, if you have a template like this:

```yaml
templates:
  utter_greet:
  - text: "Hey, {name}. How are you?"
```

Rasa will automatically fill that variable with a value found in a slot called `name`.

In custom code, you can retrieve a template by using:

```python
class ActionCustom(Action):
   def name(self):
      return "action_custom"

def run(self, dispatcher, tracker, domain):
      dispatcher.utter_template("utter_default", tracker)
      # ... other code
      return []
```

If the template contains variables denoted with `{my_variable}` you can supply values for the fields by passing them as keyword arguments to `utter_template`:

```python
dispatcher.utter_template("utter_default", tracker, my_variable="my text")
```

## [Variations](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id9)

If you want to randomly vary the response sent to the user, you can list multiple responses and Rasa will randomly pick one of them, e.g.:

```yaml
templates:
  utter_greeting:
  - text: "Hey, {name}. How are you?"
  - text: "Hey, {name}. How is your day going?"
```

## [Ignoring entities for certain intents](https://legacy-docs-v1.rasa.com/1.3.10/core/domains/#id10)

If you want all entities to be ignored for certain intents, you can add the `use_entities: []` parameter to the intent in your domain file like this:

```yaml
intents:
  - greet:
      use_entities: []
```

To ignore some entities or explicitly take only certain entities into account you can use this syntax:

```yaml
intents:
- greet:
    use_entities:
      - name
      - first_name
    ignore_entities:
      - location
      - age
```

This means that excluded entities for those intents will be unfeaturized and therefore will not impact the next action predictions. This is useful when you have an intent where you don’t care about the entities being picked up. If you list your intents as normal without this parameter, the entities will be featurized as normal.