This is an example data service, built using the Web::DataService framework.  It provides
information about the historical population of U.S. states, based on data from the
L<Bureau of the Census|http://www.census.gov/>.

You can use this code as a basis for building your own data services.

=for wds_anchor OPERATIONS

=head2 OPERATIONS

The following data service operations are available:

<% NODELIST(opt_usage=1) %>

<% FORMAT_SECTION(opt_extended=1) %>

<% VOCAB_SECTION(opt_extended=1, opt_all=1) %>