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[EP-tech] a question about: render_data_element

Hi All,
i find a function like this:

render_data_element( int, value, value );

eg. $dc->appendChild(  $plugin->{session}->render_data_element( 8,
"dc:".$_->[0], $_->[1] ) );

What does it mean the first argument, the int number?
I can't find documentation about it

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