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Each of the form callbacks is passed a context object. This is a hashref you
are allowed to use to maintain state between your callbacks. There is a new
context object created for every form on your XSP page. There are two
entries filled in automatically into the hashref for you:

=over 4

=item Form

This is actually an Apache::Table object, so it looks and works just like an
ordinary hashref, and contains the values submitted from the form, or is
perhaps empty if the form hasn't been submitted yet. It may also contain any
parameters passed in the querystring. For multi-value parameters, they can
be accessed via Apache::Table's get, add and set methods. See
L<Apache::Table>.

=item Apache

The Apache entry is the apache request object for the current request. You
can use this, for example, to get the current URI, or to get something out