Summary of error handling

[Rod Widdowson]

> I've only coded Velocity so far, since JSP views can always do anything
> Velocity can much more easily.

Slightly orthogonal question - which I think I know the answer for:  How
much do we care about the jsps in these new situations?  That is, they may
work but how much effort do we put in beyond that?

I initially thought of the jsp (particularly the login one) as being a
legacy placeholder support - people may need to do some coding, but the look
and feel is established and so we have lowered the impedance against
upgrading.

However, and I think this is the answer to my question,  jsp by its nature
is far more powerful than velocity, hence we have to actively support this
for the 1% who need this power (out of the 10% who will make any changes to
the out of the box config).

So to take the case of I18N - if someone needs to do this properly (and I'm
guessing Switch are at the forefront of that) then they are probably going
to need the "get out of jail card" that is jsp, and live with the pain.

Therefore we need to ensure that we have enough example code in our jsps
that the 0.1% can make progress.

Make sense?