I think Steve's point that if they are made too powerful, there is a
real chance that they will be used exclusively is a very real danger
(or to be precise, the danger I see is that people will start shipping
the embedded stylesheet and the document together, thereby losing a
great amount of flexibility (unless one can turn PI processing off)).
Steve (as usual) has a good point about the location requirement. I
too think they should (must even) occur *after* the start tag. While
for HTML this is not critical, for more structured documents, it will
So far, everyone seems to agree that they are of practical value.
TROFF (groff :-)) anyone?