All field keywords beginning with
html_form_ are passed directly into the form hash.
they are really defined in form.tt which ships with Gantry.
html_form_default_value specifies a fall back value to use when no other default can be found.
Note that this affects HTML only and has nothing to do with SQL.
For SQL defaults,
you need to do something in the
is statement or a literal SQL statement.
To see an example, build:
bigtop -c example.bigtop all
Change to the newly created Kids directory and look in the form method in lib/Kids/GEN/Child.pm.