In this post about Sjoerd's example Smart Tag breaking K-Meleon, I invoked the adage,
This paper mentioned on rss-dev, Be strict with your output and lenient with your input.
Why the Internet is Good,
cites it as:
Be conservative in what you do, be liberal in what you accept from others.Jon Postel. (IETF) IETF networking protocol design maxim. [source: USC]
