Data kinds

Created by Initialize Resources.

Data kind	Payload shape	Cardinality	Schema format
Observation	Structured	Single	JSON Schema
Telemetry Event	Structured	Stream	JSON Schema
Asset State	Structured	Single	JSON Schema
Tabular Records	Tabular	Collection	CSV columns
Generic JSON Payload	Structured	Single	JSON (empty schema)
XML Document	Structured	Single	XML / XSD (empty)
Avro Record	Structured	Single	Avro (empty)
Document	Text	Single	— (plain text)
Binary Blob	Binary	Single	—

Observation

Used by observation pipelines and the Observation dashboard — keep it unchanged.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Observation",
  "type": "object",
  "properties": {
    "id": { "type": "string" },
    "digitalResourceID": { "type": "string" },
    "digitalResourceName": { "type": "string" },
    "assetID": { "type": "string" },
    "assetName": { "type": "string" },
    "dataKindID": { "type": "string" },
    "dataKindName": { "type": "string" },
    "timestamp": { "type": "string", "format": "date-time" },
    "value": { "type": "string" }
  },
  "required": ["id", "digitalResourceID", "digitalResourceName", "assetID", "assetName",
               "dataKindID", "dataKindName", "timestamp", "value"],
  "additionalProperties": false
}

Telemetry Event

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Telemetry Event",
  "type": "object",
  "properties": {
    "eventTime": { "type": "string", "format": "date-time" },
    "assetId": { "type": "string" },
    "metric": { "type": "string" },
    "value": {},
    "unit": { "type": "string" }
  },
  "required": ["eventTime", "assetId", "metric", "value"],
  "additionalProperties": true
}

Asset State

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Asset State",
  "type": "object",
  "properties": {
    "timestamp": { "type": "string", "format": "date-time" },
    "assetId": { "type": "string" },
    "state": { "type": "string" },
    "attributes": { "type": "object" }
  },
  "required": ["timestamp", "assetId", "state"],
  "additionalProperties": true
}

Tabular Records

CSV column definitions:

Column	Type	Required
timestamp	date	yes
asset_id	string	yes
value	number	no