+import java.util.*;
+
+public interface DasSource
+{
+
+ public void setLocal(boolean flag);
+
+ public boolean isLocal();
+
+ /**
+ * compare if two das sources are equal
+ *
+ * @param ds
+ * @return returns true if two DAS sources are equivalent
+ */
+ public boolean equals(DasSource ds);
+
+ /**
+ * classes that implement equals, should also implement hashKey
+ *
+ * @return the hash code of a das source
+ */
+ public int hashCode();