IndieWebCamp – Principles:

“Own your data.

Use visible data for humans first, machines second.

[…] Whatever you build should be for yourself. If you aren't depending on it, why should anybody else?

[…] The more your code is modular and composed of pieces you can swap out, the less dependent you are on a particular device, UI, templating language, API, backend language, storage model, database, platform.

[…] We should be able to build web technology that doesn't require us to destroy everything we've done every few years in the name of progress.”

Great principles for all content-centric software, not just the IndieWeb. “Data for humans first, machines second” sounds like RDFa to me…