Read createdBy and authoredBy from the manifest.

Return the Agent and list of Agents, respectively.

lib/ro-bundle/file.rb

@@ -64,6 +64,14 @@ def created_on
       parse_time(:createdOn)
     end
 
+    # :call-seq:
+    #   created_by -> Agent
+    #
+    # Return the Agent that created this Research Object.
+    def created_by
+      @created_by ||= Agent.new(manifest["createdBy"])
+    end
+
     # :call-seq:
     #   authored_on -> Time
     #
@@ -72,6 +80,16 @@ def authored_on
       parse_time(:authoredOn)
     end
 
+    # :call-seq:
+    #   authored_by -> Agents
+    #
+    # Return the list of Agents that authored this Research Object.
+    def authored_by
+      @authored_by ||= (manifest["authoredBy"] || []).map do |agent|
+        Agent.new(agent)
+      end
+    end
+
     protected
 
     def manifest

test/tc_read.rb

@@ -22,8 +22,15 @@ def test_verify
   def test_manifest
     ROBundle::File.open($hello) do |b|
       assert_equal("/", b.id)
+
       assert b.created_on.instance_of?(Time)
       assert_nil b.authored_on
+
+      creator = b.created_by
+      assert creator.instance_of?(ROBundle::Agent)
+
+      author = b.authored_by
+      assert author.instance_of?(Array)
     end
   end