The Simple IoT Core data model consists of three parts.
The core consists of the things and the associated value descriptions.
Things contain the device values and the descriptions describe how a value is to be interpreted.
The system part contains DTOs which, for example, contain the things that can be created or which gateways are available. 

Things

Values

System

Simple IoT Core

IoT Logic Core

IoT Template Core

System Commands

Thing Commands

Logic Commands

Template Commands

IoT Command Core

IoT Core Data Model

SmartNode

SmartNode - EN

Introduction

AWS Shadow Device Client

AWS IoT Core Client

Azure IoT Core Client

Generic REST Server

Generic Web Export

Generic MQTT Client

IoT Core MQTT Client

Simple EnOcean MQTT Client

Home Assistant MQTT Client

Spaceti AWS Client

Connection Template

Generic IoT Data Model

IoT Export

Sensor Template Import