public function tagcompra($xNEmp = '', $xPed = '', $xCont = '')
{
$this->compra = $this->dom->createElement("compra");
$this->dom->addChild($this->compra, "xNEmp", $xNEmp, false, "Nota de Empenho");
$this->dom->addChild($this->compra, "xPed", $xPed, false, "Pedido");
$this->dom->addChild($this->compra, "xCont", $xCont, false, "Contrato");
return $this->compra;
}