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    [BLOCK1]
      KEY1=VALUE1
    ...
    [BLOCK2]
      KEY1=VALUE1
      KEY2=VALUE2
    
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    #!/usr/bin/perl
    use warnings;
    ...
        warn( "Parameter '$_' is missing from INI!\n" )
          unless exists $config{$_};
    }
    
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    foo 'test'
    baz 'test-2'
    
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    Parameter 'bar' is missing from INI!
    Parameter 'quux' is missing from INI!
    
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    #!/usr/bin/perl
    use warnings;
    ...
        warn( "Parameter '$_' is missing from INI!\n" )
          unless exists $config{'requirements.%test-2'};
    }
    
  6. or download this
    [requirements]
    @test=('bar' 'baz')
    %test-2=( bar => 1 , baz => 2 )
    test_foo='foo'
    quux_test='quux'
    
  7. or download this
    Requirements foo
    Requirements Array (bar baz)
    ...
    Parameter 'bar' is missing from INI!
    Parameter 'baz' is missing from INI!
    Parameter 'quux' is missing from INI!