How to reference json schema definition from another schema - json

Question

I have a json schema representing a geometry as a Point or a MultiPoint. Each is defined within the schema in "definitions":
{
"$schema": "http://json-schema.org/draft-04/schema#",
"id": "http://schema.my-site.org/geometry.json#",
"type": "object",
"oneOf": [
{
"allOf": [
{
"required": [
"type",
"coordinates"
]
},
{
"oneOf": [
{
"$ref": "#/definitions/Point"
},
{
"$ref": "#/definitions/MultiPoint"
}
]
}
]
}
],
"definitions": {
"Point": {
"title": "Point",
"type": "object",
"properties": {
"type": {
"enum": [
"Point"
]
},
"coordinates": {
"$ref": "#/definitions/position"
}
}
},
"MultiPoint": {
"title": "MultiPoint",
"type": "object",
"properties": {
"type": {
"enum": [
"MultiPoint"
]
},
"coordinates": {
"$ref": "#/definitions/positionArray"
}
}
},
"position": {
"type": "array",
"minItems": 2,
"maxItems": 2,
"additionalItems": false,
"items": [
{
"type": "number"
},
{
"type": "number"
}
]
},
"positionArray": {
"type": "array",
"items": {
"$ref": "#/definitions/position"
}
}
}
}
Now I want to make another schema, which makes use of the Point definition. Currently, I copypasted the definitions for Point and position in the properties "startPosition" and "endPosition" and it works. But is there a way how to just reference the Point's definition from my geometry.json schema?
note: I only want to allow Point to be used here but not a MultiPoint - A geometry.json ref would allow both instead.
{
"$schema": "http://json-schema.org/draft-04/schema#",
"id": "http://schema.my-site.org/myitem.json#",
"type": "object",
"additionalProperties": false,
"required": [
"myproperty"
],
"properties": {
"myproperty": {
"type": "array",
"minItems": 0,
"items": {
"type": "object",
"additionalProperties": false,
"properties": {
"id": {
"type": "string"
},
"startPosition": {
"geometry": {
"required": [
"type",
"coordinates"
],
"title": "Point",
"type": "object",
"properties": {
"type": {
"enum": [
"Point"
]
},
"coordinates": {
"type": "array",
"minItems": 2,
"maxItems": 2,
"additionalItems": false,
"items": [
{
"type": "number"
},
{
"type": "number"
}
]
}
}
}
},
"endPosition": {
"geometry": {
"required": [
"type",
"coordinates"
],
"title": "Point",
"type": "object",
"properties": {
"type": {
"enum": [
"Point"
]
},
"coordinates": {
"type": "array",
"minItems": 2,
"maxItems": 2,
"additionalItems": false,
"items": [
{
"type": "number"
},
{
"type": "number"
}
]
}
}
}
}
}
}
}
}
}

Answer 1

Haven't tested it myself, but according to this, you can make use of JSON pointers:
In file geometry.json:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"id": "http://schema.my-site.org/geometry.json",
"type": "object",
"definitions": {
"Point": { ...},
"MultiPoint": {...}
}
}
In file myitem.json:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"id": "http://schema.my-site.org/myitem.json#",
"type": "object",
"properties": {
"point": {
"$ref": "http://schema.my-site.org/geometry.json#definitions/Point"
}
}
}