private static String getExternalAddressRepresentation(Program program, Address address) {
		Symbol symbol = program.getSymbolTable().getPrimarySymbol(address);
		if (symbol == null) {
			return "External[ BAD ]";
		}
		ExternalLocation extLoc = program.getExternalManager().getExternalLocation(symbol);
		Address extAddr = extLoc.getAddress();
		if (extAddr != null) {
			return "External[" + extAddr.toString() + "]";
		}
		return "External[ ? ]";
	}
@return true if location corresponds to memory address
Ghidra/Features/Base/src/main/java/ghidra/util/table/field/AddressBasedLocation.java