change back list of ids to a single one

Author: micheldumontier

schemas/smartapi_schema.json

@@ -145,18 +145,8 @@
           "description": "The role of the contact person. Values can be: responsible organization,responsible developer,contributor,support."
         },
         "x-id": {
-          "oneOf": [
-            {
-              "type": "array",
-              "item": {
-                "type": "string"
-              }
-            },
-            {
-              "type": "string"
-            }
-          ],
-          "description": "The identifier of of the contact person (e.g. orchid Id)"
+          "type": "string",
+          "description": "An HTTP identifier for the contact (e.g. orcid id github id)"
         }
       }
     },

versions/3.0.0.md

@@ -287,7 +287,7 @@ This object MAY be extended with [Specification Extensions](#specificationExtens
 Field Name | Type | Description
 ---|:---:|---
 <a name="contactRole"></a>x-role | `enum` | **REQUIRED** Indicate the role of the contact. Values can be: `responsible organization`,`responsible developer`,`contributor`,`support`.
-<a name="contactId"></a>x-id | [`string`] | **SHOULD** One or more unique identifiers for the contact.
+<a name="contactId"></a>x-id | `string` | **SHOULD** A unique identifiers for the contact.
 
 
 ##### Contact Object Example: