Section

Data Operations

Data Operations process and publish data: they shape raw data into Smart Data Model entities, write them to the Stellio context broker, manage subscriptions and expose database content as an interface.

Packages

Areas of responsibility

8 nodes

NGSI-LD and Stellio

Build entities according to Smart Data Models, create and update them in Stellio, query entities and types, and create, list and delete subscriptions.

• NGSI-LD Builder
• Post to Stellio
• Entities
• Types
• Subscriptions

Open package →

1 node

Endpoints

Serve the results of PostgreSQL queries as CSV via an HTTP endpoint, for example for spreadsheets and analysis tools.

• PostgreSQL
• CSV
• HTTP

Open package →

Interaction

From raw record to entity

The two central nodes of the NGSI-LD package form the end of almost every data chain.

1

Raw data

A Data Connector or any other node delivers a JSON object with measurements and identifiers.

→

2

NGSI-LD Builder

Maps the fields to a Smart Data Model, generates the URN identifier and adds the @context.

→

3

Post to Stellio

Creates the entity in the context broker or updates existing attributes.

Result: The entity is available through the NGSI-LD API of the Urban Data Space Platform and triggers subscriptions where applicable.