John's proposed wording for Principle 4

Hello,

While John was working on edits to the introduction, he also wrote a 
proposal to change the wording for Principle 4 since  "There are a number 
of comments (e.g., in the issues list for the Introduction) which say that 
this is hard to understand."

<current>
Content must be robust enough to work with current and future
technologies </current>

<proposed>
Content must be able to work with current and future technologies
</proposed>

Best,
--wendy