my %data = (
    'attributes' => {
        '_name' => 'mydata',
        'height' => 50,
        'width'  => '80%',
    },
    'children' => [
        { 'attributes' => { '_name' => 'bob', ...} ...},
        { 'attributes' => { '_name' => 'tom', ...} ...},
    ],
    'content' => 'yadda yadda ...',
);