fiware / tutorials.relationships-linked-data

:blue_book: FIWARE 602: Linked Data Relationships and Data Models

This tutorial discusses relationships between linked data entities and how the concepts of JSON-LD and NGSI-LD can be used to interrogate entities and navigate from one entity to another. The tutorial discusses a series of simple linked-data data models based around the supermarket chain’s store finder application, and demonstrates how to design models holding one-to-one, one-to-many and many-to-many relationships. This NGSI-LD tutorial is a direct analogue to the earlier Understanding Entities and Relationships tutorial (which was based on the NGSI v2 interface). The differences in relationships created using NGSI v2 and NGSI-LD are highlighted and discussed in detail.

The tutorial uses cUrl commands throughout, but is also available as Postman documentation.

Start-Up

NGSI-LD Smart Supermarket

NGSI-LD offers JSON-LD based interoperability used for Federations and Data Spaces. To run this NGSI-LD tutorial for NGSI-v2 developers, use the NGSI-v2 branch.

git clone https://github.com/FIWARE/tutorials.Relationships-Linked-Data.git
cd tutorials.Relationships-Linked-Data
git checkout NGSI-v2

./services create
./services start

	📚 Documentation	Postman Collection

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License

MIT © 2019-2024 FIWARE Foundation e.V.

tutorials.relationships-linked-data's Issues

waitForMongo not defined in services script

The services script in all the 3 tutorials below, refers to waitForMongo. This is not defined and hence gives an error while starting.

https://github.com/FIWARE/tutorials.Linked-Data/blob/NGSI-v2/services
https://github.com/FIWARE/tutorials.Working-with-Linked-Data/blob/NGSI-v2/services
https://github.com/FIWARE/tutorials.Relationships-Linked-Data/blob/NGSI-v2/services

Please add the same:

waitForMongo () {
echo -e "\n⏳ Waiting for \033[1mMongoDB\033[0m to be available\n"
while ! [ docker inspect --format='{{.State.Health.Status}}' db-mongo == "healthy" ]
do
sleep 1
done
}

Start Up command correction

Here: https://github.com/FIWARE/tutorials.Relationships-Linked-Data#start-up

The command ./services start needs to be replaced with ./services orion or 'scorpio' or 'stellio'

Stellio missing from the list of context brokers

In this section : https://github.com/FIWARE/tutorials.Relationships-Linked-Data?tab=readme-ov-file#start-up stellio is missing from the list of context brokers that can be used.

Example description needs check

https://github.com/FIWARE/tutorials.Relationships-Linked-Data/tree/NGSI-v2#display-all-shelves

This example description mentions that this is an example of using the q parameter, but this example uses type=Shelf.

Incorrect entity in description

https://github.com/FIWARE/tutorials.Relationships-Linked-Data/tree/NGSI-v2#display-all-shelves

Please replace Product with Shelf in the description.