Re: 4. Are PIs allowed?

>
> Allowed anywhere. I don't have strong feelings on whether start-tag
> syntax should be enforced (e.g. PHP doesn't adhere to it) but overall I
> think if they don't go in the data model then their syntax isn't too
> important.
>

So, with this approach, they're basically comments, which raises the
question: why do we need two syntaxes for comments?

James