By convention? You mean, by application.
An inclusion on root makes an empty element available
to every location. A PI is something every document has to have.
That isn't an improvement. If you use a DOCTYPE and know the DTD,
don't
you get the same effect? XML goes out it's way to load up an
instance just to get around a DTD. I question the utility of that.
We tell them they are being freed of fixed markup, then add a
question mark and say, oh, that's OK, that's XML.
> I don't think links in general should be done this way, but I do believe in
> PIs being used for, uh, instructions to processors.
Ummm... sure. Sort of what links are.
> (In other words, I'm
> not 100% against PIs, as some people are.) In particular, I'm starting to
> get very fond of PIs for anything that has to be specified per entity.
No doubt.
len