--- /dev/null
+require 'dag'
+
+#===========================
+# Task Class
+# ==========================
+class DAG::Task < DAG::SdTask
+
+ def initialize(*args)
+ super(args)
+ end
+
+ def name()
+ super(self)
+ end
+
+ def startTime()
+ super(self)
+ end
+
+ def finishTime()
+ super(self)
+ end
+
+end
+
+#=============================
+# WorkStation Class
+#=============================
+class DAG::Workstation < DAG::SdWorkstation
+
+ def initialize()
+ super()
+ end
+
+ def name()
+ super(self)
+ end
+
+end
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