6 my $solver = DX::Solver->new;
10 has name => (is => 'ro', required => 1);
12 package My::ShellInstalled;
14 has server => (is => 'ro', required => 1);
15 has shell => (is => 'ro', required => 1);
18 $solver->facts->{server} = DX::OrderedSet->new(
19 values => [ map My::Server->new(name => $_), qw(one two three four five) ]
21 $solver->facts->{shell_installed} = DX::OrderedSet->new(
23 (map My::ShellInstalled->new(server => $_, shell => 'bash'),
25 (map My::ShellInstalled->new(server => $_, shell => 'csh'),
30 my @r = $solver->query([ 'X' ],
31 [ findall => X => S =>
32 [ member_of => 'S', \'server' ],
33 [ exists => [ qw(Name SI) ] =>
34 [ member_of => 'SI', \'shell_installed' ],
35 [ prop => 'SI' => \'server' => 'Name' ],
36 [ prop => 'S' => \'name' => 'Name' ],
37 [ prop => 'SI' => \'shell' => \'bash' ]
43 [ map $_->name, $r[0]->value_for('X')->all ],
44 [ qw(one three four) ]