Definition of "extensibility" []

• The capability of being extended (noun)
• A quality of design that takes possible future advances into consideration and attempts to accommodate them (noun)

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• "Semantic extensibility is harder, but can also be done."
• "Coflight is also the first FDP to enjoy an open architecture funded over Standard and Open Source middleware technologies to guarantee the long-term extensibility, scalability and availability of supply."
• "We’ve built in extensibility points, so you can add functionality to Facebook Open Platform like your own tags and API methods."