Opt-in flag to skip content of a node with no backing fields

There is a quite frequent case when we do not need to parse the whole XML, but only meaningful parts of it. In those cases it makes no sense to describe the whole structure in code, but only those things that are actually useful.

The proposal is following: Make a global opt-in flag which will replace all field not found errors with warnings and add additional per-class annotation flag which will override global flag. It will also allow to solve #15 by automatically toggling unsafe parse for top-level node.

I can try to contribute a solution if you approve.

[pdvrieze]

The master branch now properly implements a handler hook for unexpected content. This hook can either throw an exception, print a warning, ignore it etc. This is set in the configuration block of the parser.

[pdvrieze]

The fixed code is now in master. There are some tests that use it. One way to trigger the new approach is: Xml(myModule) { autoPolymorphism = true }.stringify(value)

You can also just have a configuration object you reuse.

Please have a look and see whether it works for you.