-<!ATTLIST cluster sharing_policy (SHARED|FULLDUPLEX|FATPIPE) "SHARED">
-<!ATTLIST cluster bb_bw CDATA #REQUIRED>
-<!ATTLIST cluster bb_lat CDATA #REQUIRED>
+<!ATTLIST cluster sharing_policy (SHARED|FULLDUPLEX|FATPIPE) "FULLDUPLEX">
+<!ATTLIST cluster bb_bw CDATA "">
+<!ATTLIST cluster bb_lat CDATA "">