<!-- A zone is either an internal node that contains other zones,
or a leaf containing hosts and other leaf-like elements -->
<!ELEMENT zone ((prop*),
- (((AS|zone|include|link|backbone|cabinet|cluster|peer|trace|trace_connect)*,
+ (((AS|zone|include|link|backbone|cluster|peer|trace|trace_connect)*,
(zoneRoute|ASroute|trace|trace_connect|bypassASroute|bypassZoneRoute)*,
(trace|trace_connect)*)
|((include|storage_type|storage|host|cabinet|router|link|backbone|trace|trace_connect|host_link)*,