RFC #0201: XP Overlays

Scope of Change
Path files will support prepending elements to the class path via special syntax.

Rationale
Sometimes it's necessary to overwrite certain parts of the XP framework's classes (the ones distributed in xp-rt xar files). One of the usecases is to keep using deprecated APIs in conjunction with a release in which they were removed, but being able to use new APIs provided with this release in other parts of the program. Another example is the ability to production- test new functionality (e.g., from SVN head, or even from the experiments in xp forge) together with the latest release.

Read the full RFC here

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