more on Postel's law

In a post that doesn't have anything explicit to do with XML, Edd 
Dumbill (previously XML.com and xmlhack.com editor) writes:

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The fact of it is that being liberal in what you accept is really hard. 
You basically have two options: look carefully for only the information 
you need, which I think is the spirit of Postel’s law, or implement 
something powerful that will take care of many use cases. This latter 
strategy, though seemingly quicker and more future-proof, is what often 
leads to bugs and security holes, as unintended applications of powerful 
parsers manifest themselves.

<http://radar.oreilly.com/2013/03/lets-do-this-the-hard-way.html>
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There's a lot more food for thought there, but "look carefully for only 
the information you need" is at the heart of the models I think will 
move markup practice forward.

Thanks,
-- 
Simon St.Laurent
http://simonstl.com/