currency=unique identifier of a currency (should consist of three characters)
noofdives=number of dives included for this price
<pricedivepackage> puts ino brackets the price (given as a real number) for a dive package (at a dive basis). Given as attributes are the currency, and the number of dives included in this package.
<divebase>, <priceperdive>, <trip>
(see also <divebase>)
<!-- Are 500 Euro for 10 dives really a "special" price??? :-) -->
<pricedivepackage currency="EUR" noofdives="10">500.0</pricedivepackage>