@Override
	public void deleteAddressRange(Address startAddr, Address endAddr, TaskMonitor monitor)
			throws CancelledException {
		lock.acquire();
		try {
			namespaceMap.clearRange(startAddr, endAddr);
		}
		finally {
			clearCache();
			lock.release();
		}
	}
Construct a new namespace manager.
@param handle the database handle.
@param errHandler the error handler.
@param addrMap the address map
@param openMode the open mode
@param lock the program synchronization lock
@param monitor the task monitor.
@throws VersionException if the table version is different from this adapter.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/NamespaceManager.java