Is there a json or yaml file that defines the airbyte protocol schema and structure? I'm unsure if "namespace" is a required element in all messages.

Yes, there are JSON and YAML files that define the schema and structure for various components in Airbyte, including the Airbyte Protocol. For the Airbyte Protocol, the

namespace

field is not required in all messages. Specifically, in the

AirbyteRecordMessage

, the

namespace

field is optional. Here is the relevant schema definition for `AirbyteRecordMessage`:

yaml AirbyteRecordMessage:    type: object    additionalProperties: true    required:    - stream    - data    - emitted_at    properties:      namespace:        description: "namespace the data is associated with"        type: string      stream:        description: "stream the data is associated with"        type: string      data:        description: "record data"        type: object        existingJavaType: com.fasterxml.jackson.databind.JsonNode      emitted_at:        description: "when the data was emitted from the source. epoch in millisecond."        type: integer

You can find more details about the

AirbyteRecordMessage

and its fields [here](https://docs.airbyte.com/understanding-airbyte/airbyte-protocol#airbyterecordmessage). For the full schema definition for the YAML file used in low-code connector development, you can refer to the following links: - [Full schema definition for the YAML file](https://raw.githubusercontent.com/airbytehq/airbyte/master/airbyte-cdk/python/airbyte_cdk/sources/declarative/declarative_component_schema.yaml) - [JSON schema representation of the relationships between components](https://docs.airbyte.com/assets/files/declarative_component_schema-8086fd17046cc931503fbecd504ee946.yaml) These resources should help you understand the schema and structure of the Airbyte Protocol and the role of the

namespace

field.