Rationale
Problem: You deploy multiple configurations of your system, perhaps choosing between a real and simulated robot, some real and simulated device, etc. You want to parameterize the deployments to reduce the number of files you have to write for the varying configuration combinations
Solution: Use the XML ENTITY element.
Assumptions
- Works with Xerces only (v2 tested, v3 should also support this). Will not work with the default TinyXML processor.