<span class='op'>(</span>
  <span class='va'>data</span>,
  <span class='va'>...</span>,
  key <span class='op'>=</span> <span class='st'>"key"</span>,
  value <span class='op'>=</span> <span class='st'>"value"</span>,
  columns <span class='op'>=</span> <span class='cn'>NULL</span>,
  na.rm <span class='op'>=</span> <span class='cn'>FALSE</span>,
  convert <span class='op'>=</span> <span class='cn'>FALSE</span>,
  factor_key <span class='op'>=</span> <span class='cn'>FALSE</span>,
  use_one_of <span class=