Making Valid JSON-LD Schema & Object Instance-CodePudding

I'm trying to create a graph database for describing power systems and this is my first time using JSON-LD.

Steps so far:

Created a schema according to the

Schema
```
{
  "$id": "https://osuked.github.io/Power-Station-Dictionary/power-station",

  "type": "object",
  "properties": {
    "capacity": { "type": "float" },
    "fuel-type": { "type": "string" }
  },
  "required": ["capacity", "fuel-type"]
}
```
Example object instance
```
{
  "@context": "https://osuked.github.io/Power-Station-Dictionary/power-station.json",
  "@id": "http://osuked.github.io/Drax",
  "capacity": 12,
  "fuel-type": "wind"
}
```
CodePudding user response：

Check the definition of the context (https://json-ld.org/spec/latest/json-ld/#the-context). It must specify how your properties (capacity and fuel-type) map to RDF properties. You can either provide the definitions inline or point to a URL that contains this mapping (e.g. https://schema.org/docs/jsonldcontext.jsonld).

In your example, you provide the URL https://osuked.github.io/Power-Station-Dictionary/power-station.json. It contains a JSON document but does not contain the JSON-LD context, because JSON Schema != JSON LD (you might find this article helpful to understand the difference: https://dashjoin.medium.com/json-schema-schema-org-json-ld-whats-the-difference-e30d7315686a).

Therefore, the JSON LD playground does not show an error (no property definitions found) but also shows no parsed triples.

To fix this, you can try using "@context": "http://schema.org/", you can define a namespace prefix p,
```
{
  "@context": {
    "p": "https://osuked.github.io/Power-Station-Dictionary/power-station/"
  },
  "@id": "http://osuked.github.io/Drax",
  "p:capacity": 12,
  "p:fuel-type": "wind"
}
```
or define the properties individually:
```
{
  "@context": {
    "capacity": "https://osuked.github.io/Power-Station-Dictionary/power-station/capacity",
    "fuel-type": "https://osuked.github.io/Power-Station-Dictionary/power-station/fuel-type"
  },
  "@id": "http://osuked.github.io/Drax",
  "capacity": 12,
  "fuel-type": "wind"
}
```