FluidXml\FluidInsertionHandler::insertSpecialAttribute PHP Method

    protected function insertSpecialAttribute($parent, $k, $v)
    {
        // The user has passed an attribute name and an attribute value:
        // [ '@attribute' => 'Attribute content' ]
        $attr = \substr($k, 1);
        $this->newContext($parent)->setAttribute($attr, $v);
        return [];
    }