if (!AX_surfxml_cluster_power) FAIL("Required attribute `power' not set for `cluster' element.");
if (!AX_surfxml_cluster_bw) FAIL("Required attribute `bw' not set for `cluster' element.");
if (!AX_surfxml_cluster_lat) FAIL("Required attribute `lat' not set for `cluster' element.");
if (!AX_surfxml_cluster_power) FAIL("Required attribute `power' not set for `cluster' element.");
if (!AX_surfxml_cluster_bw) FAIL("Required attribute `bw' not set for `cluster' element.");
if (!AX_surfxml_cluster_lat) FAIL("Required attribute `lat' not set for `cluster' element.");