location attribute not expanding like other core context attributes (for example status)

[dimitriskranias]

Hello everyone,

I face this rather peculiar issue of location attribute not expanding according to the core context, which I am not 100% sure it really is an issue or if it should be working like that (in the NGSI-LD specification and Orion-LD's Quick Start Guide I didn't find something that states that it shouldn't expand). I provide the data point that describes this:

{
  "_id": {
    "id": "urn:Demo3Temp:HydroPlant:002",
    "type": "https://dummyontology/v1.5/HydroPlant",
    "servicePath": "/"
  },
  "attrNames": [
    "location",
    "https://uri.etsi.org/ngsi-ld/status"
  ],
  "attrs": {
    "location": {
      "type": "GeoProperty",
      "creDate": 1726750264.2335553,
      "modDate": 1726750264.2335553,
      "value": {
        "type": "Point",
        "coordinates": [
          -3.8975999999999997,
          37.0154
        ]
      },
      "mdNames": []
    },
    "https://uri=etsi=org/ngsi-ld/status": {
      "type": "Property",
      "creDate": 1726750264.2335553,
      "modDate": 1726750264.2335553,
      "value": "OK",
      "mdNames": []
    }
  },
  "creDate": 1726750264.2335553,
  "modDate": 1726750264.2335553,
  "lastCorrelator": ""
}

As you see the type and status expands correctly using the context I provided via the link header: https://dummyontology/v1.5/orionld-context-v1.5.jsonld; rel="http://www.w3.org/ns/json-ld#context" which includes this:

{
    "@context": [
        "https://dummyontology/v1.5/dummy-context-v1.5.jsonld",
        "https://uri.etsi.org/ngsi-ld/v1/ngsi-ld-core-context-v1.6.jsonld"
    ]
}

The first is the URL pointing to my custom context and the second is the core context (which as stated in the NGSI-LD Specification is good practice to include in the @context Array).

So is this an omission in the Orion-LD's implementation of NGSI-LD or is it me that i haven't understood something correctly?

[kzangeli]

Hi, your observation is correct. The "location" attribute isn't expanded. As it is part of the core context, it will always be expanded and compacted the exact same way.

It's a design decision in Orion-LD to not expand this attribute. To save some time ...

You will see the same is valid for "observedAt" and many more names. All of them with a special mention in the ngsi-ld spec and part of the core context.

Don't worry about it. All is good :)