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The module Data::Flow provides its services via objects.
The objects may be obtained by the usual
$request = new Data::Flow $recipes;
paradigm. The argument $recipes is a hash reference, which
provides the rules for request processing. The objects
support two methods, set() and get(). The first one is
used to provide input data for processing, the second one
to obtain the output.
The unit of requested information is a field. The method
set() takes a pair field => value, the method get() takes
one argument: the field.
Every object is created without any fields filled, but it
knows how to construct fields basing on other fields or
some global into. This knowledge is provided in the
argument $recipe of the new() function. This is a
reference to a hash, keyed by fields. The values of this
hash are hash references themselves, which describe how to
acquire the field which is the corresponding key of the
initial hash.
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