Additions meant to be part of #398

Author: philipashlock

Diff for: v1.1/examples/catalog-sample-extended.json

@@ -57,7 +57,7 @@
                     "title": "Widgets REST API"
                 }
             ], 
-            "identifier": "widgets-0001", 
+            "identifier": "http://dx.doi.org/10.7927/H4PZ56R2", 
             "issued": "2011-11-22", 
             "keyword": [
                 "widget", 
@@ -116,7 +116,7 @@
                 "hasEmail": "mailto:[email protected]"
             }, 
             "description": "This dataset provides ranges on widget phase modulation", 
-            "identifier": "widget-modulators", 
+            "identifier": "http://dx.doi.org/10.7927/H4K64G12", 
             "issued": "2011-11-22", 
             "keyword": [
                 "widget", 
@@ -186,7 +186,7 @@
                     "title": "widgets.csv"
                 }
             ], 
-            "identifier": "widget-modulation-2011", 
+            "identifier": "http://dx.doi.org/10.7927/H49P2ZKM", 
             "isPartOf": "widget-modulators", 
             "issued": "2011-11-22", 
             "keyword": [

Diff for: v1.1/examples/catalog-sample.json

@@ -62,7 +62,7 @@
         "hasEmail": "mailto:[email protected]"
       },
       "description": "This dataset provides ranges on widget phase modulation",
-      "identifier": "http://dx.doi.org/10.7927/",
+      "identifier": "http://dx.doi.org/10.7927/H4K64G12",
       "keyword": [
         "widget",
         "modulation"

Diff for: v1.1/schema.md

@@ -531,7 +531,7 @@ Dataset Fields {#Dataset}
 **Cardinality** | (1,1)
 **Required** | Yes, always
 **Accepted Values** | String
-**Usage Notes** | This field allows third parties to maintain a consistent record for datasets even if title or URLs are updated. Agencies may integrate an existing system for maintaining unique identifiers. Each identifier **must** be unique across the agency's catalog and remain fixed. Characters should be alphanumeric. It is **highly recommended** that a [URI (preferably an HTTP URL)](http://tools.ietf.org/html/rfc3986#section-1.1.3), be used to provide a globally unique identifier. URLs should be designed and maintained to persist indefinitely regardless of whether the URL of the resource itself changes.
+**Usage Notes** | This field allows third parties to maintain a consistent record for datasets even if title or URLs are updated. Agencies may integrate an existing system for maintaining unique identifiers. Each identifier **must** be unique across the agency's catalog and remain fixed. Characters should be alphanumeric. It is **highly recommended** that a [URI (preferably an HTTP URL)](http://tools.ietf.org/html/rfc3986#section-1.1.3) be used to provide a globally unique identifier. Identifier URLs should be designed and maintained to persist indefinitely regardless of whether the URL of the resource itself changes.
 **Example** |  `{"identifier":"http://dx.doi.org/10.7927/H4PZ56R2"}`
 
 {: .table .table-striped #isPartOf}