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