These namespaces were introduced in CLR 2.0. For example for the
symbol, it's WKS::GCHeap::GcCondemnedGeneration for Workstation GC and SVR::GCHeap::GcCondemnedGeneration for Server GC (if you are reading the Investigating Memory Issues article in the recent MSDN magazine and are trying out some of the debugger commands mentioned in there).
If you are using CLR 1.1 or prior, the Workstation version lives in mscorwks.dll while the Server version lives in mscorsvr.dll so the symbol names are not prefixed with WKS:: or SVR::. So the breakpoint
bp mscorwks!WKS::GCHeap::RestartEE "j (dwo(mscorwks!WKS::GCHeap::GcCondemnedGeneration)==2) 'kb';'g'"
bp mscorwks!GCHeap::RestartEE "j (dwo(mscorwks! GCHeap::GcCondemnedGeneration)==2) 'kb';'g'"