{
	"domains": [
		{
			"name": "address",
			"description": "collection of addresses",
			"key_field": {
				"name": "id"
			},
			"data_fields": [
				{
					"name": "city",
					"description": "the name of the city",
					"nullable": false,
					"type": "string_medium"
				},
				{
					"name": "zip",
					"description": "the postal code",
					"nullable": false,
					"type": "string_medium"
				},
				{
					"name": "street",
					"description": "the name of the street and the house number",
					"nullable": false,
					"type": "string_medium"
					
				}
			]
		},
		{
			"name": "person",
			"description": "collection of contacts",
			"key_field": {
				"name": "id"
			},
			"data_fields": [
				{
					"name": "prename",
					"description": "first name of the person",
					"nullable": false,
					"type": "string_medium"
				},
				{
					"name": "surname",
					"description": "last name of the person",
					"nullable": false,
					"type": "string_medium"
				},
				{
					"name": "address_id",
					"description": "reference to the associated address dataset",
					"nullable": false,
					"type": "integer"
				},
				{
					"name": "email_address",
					"description": "optional eMail address",
					"nullable": true,
					"type": "string_medium",
					"default": null
				}
			]
		}
	]
}