private function writeFloorStyle()
{
// style:style
$this->xmlContent->startElement('style:style');
$this->xmlContent->writeAttribute('style:name', 'styleFloor');
$this->xmlContent->writeAttribute('style:family', 'chart');
// style:chart-properties
$this->xmlContent->startElement('style:graphic-properties');
$this->xmlContent->writeAttribute('draw:fill', 'none');
//@todo : Permit edit color and size border of floor
$this->xmlContent->writeAttribute('draw:stroke', 'solid');
$this->xmlContent->writeAttribute('svg:stroke-width', '0.026cm');
$this->xmlContent->writeAttribute('svg:stroke-color', '#878787');
// > style:chart-properties
$this->xmlContent->endElement();
// > style:style
$this->xmlContent->endElement();
}