Add contributor.roles property

content/docs/specifications/data-package.md

@@ -255,24 +255,28 @@ The raw sources for this data package. It `MUST` be an array of Source objects.
 
 ##### `contributors`
 
-The people or organizations who contributed to this Data Package. It `MUST` be an array. Each entry is a Contributor and `MUST` be an `object`. A Contributor `MUST` have at least one property. A Contributor is RECOMMENDED to have `title` property and MAY contain `path`, `email`, `role`, and `organization` properties. An example of the object structure is as follows:
+The people or organizations who contributed to this Data Package. It `MUST` be an array. Each entry is a Contributor and `MUST` be an `object`. A Contributor `MUST` have at least one property. A Contributor is RECOMMENDED to have `title` property and MAY contain `path`, `email`, `roles`, and `organization` properties. An example of the object structure is as follows:
 
-```javascript
+```json
 "contributors": [{
   "title": "Joe Bloggs",
   "email": "[email protected]",
   "path": "http://www.bloggs.com",
-  "role": "author"
+  "roles": ["author"]
 }]
 ```
 
 - `title`: name/title of the contributor (name for person, name/title of organization)
 - `path`: a fully qualified http URL pointing to a relevant location online for the contributor
 - `email`: An email address
-- `role`: a string describing the role of the contributor. It's `RECOMMENDED` to be one of: `author`, `publisher`, `maintainer`, `wrangler`, and `contributor`. Defaults to `contributor`.
+- `roles`: an array of strings describing the roles of the contributor. A role is `RECOMMENDED` to be one of: `author`, `publisher`, `maintainer`, `wrangler`, and `contributor`. The default role is `contributor`.
   - Note on semantics: use of the "author" property does not imply that that person was the original creator of the data in the data package - merely that they created and/or maintain the data package. It is common for data packages to "package" up data from elsewhere. The original origin of the data can be indicated with the `sources` property - see above.
 - `organization`: a string describing the organization this contributor is affiliated to.
 
+:::note[Backward Compatibility]
+If the `roles` property is not provided a data consumer MUST fall back to using `role` property which was a part of the `v1.0` of the specification. This property has the same symantics but it is a string allowing to specify only a single role
+:::
+
 ##### `keywords`
 
 An Array of string keywords to assist users searching for the package in catalogs.

profiles/dictionary/common.yaml

@@ -196,9 +196,11 @@ contributor:
       title: Organization
       description: An organizational affiliation for this contributor.
       type: string
-    role:
-      type: string
-      default: contributor
+    roles:
+      type: array
+      minItems: 1
+      items:
+        type: string
   minProperties: 1
   context: Use of this property does not imply that the person was the original
     creator of, or a contributor to, the data in the descriptor, but refers to the