Update buyer/supplier terminology for PPPs

Replace buyer with publicAuthority and suppliers with privateParty

release-schema.json

@@ -15,7 +15,12 @@
  "description": "An optional description for the whole contracting process. If no process description is given, the tender, award or contract description may be used in interfaces.",
  "type": "string"
  },
- "buyer":null
+ "buyer":null,
+ "publicAuthority": {
+ "title": "Public authority",
+ "description": "The public authority is the unit/body/department within a government that is tendering and contracting the project. The public counterpart in the PPP contract.",
+ "$ref": "#/definitions/OrganizationReference"
+ }
  },
 
 "definitions":
@@ -44,6 +49,19 @@
  }
  }
  },
+ "Award": {
+ "properties": {
+ "privateParty": {
+ "title": "Private party",
+ "description": "The counter party of the procuring authority in the PPP contract. A private entity which has been granted the contract to construct and operate a government asset, and which is usually created under the form of a Special Purpose Vehicle or SPV.",
+ "type": "array",
+ "items": {
+ "$ref": "#/definitions/OrganizationReference"
+ }
+ },
+ "suppliers": null
+ }
+ },
  "Contract": {
  "properties":{
  "financialModel":{