Recommended Property Tree Enhancements: Difference between revisions

Implementation-wise, it would be possible to add support for this by either extending the current XMLVisitor code in simgear, or by sub-classing it, so that a static std::map<std::string,std::string> could be used to store variable/value pairs, and automatically parse each encountered attribute or node value for a corresponding variable identifier token that should normally not show up in common use scenarios (such as i.e. '%'). That way, all such occurrences could be automatically looked up in the std::map and resolved to their corresponding equivalents at runtime. So that users would then be able to easily refer "short hands" for well-defined locations (it might make sense to differentiate between local and global xml variables, the latter of which could automatically take effect for all parsed XML files, while the former would only use a lookup map for the root XML file or any files it references using the include directive).