src/XQueue/Maileon/API/Mailings/CustomProperty.php
function toXML() {
        $xml = new SimpleXMLElement("<?xml version=\"1.0\"?><property></property>");

        $xml->addChild("key", $this->key);
        $xml->addChild("value", $this->value);

        return $xml;
    }
function toXML() {
        $xml = new SimpleXMLElement("<?xml version=\"1.0\"?><property></property>");

        $xml->addChild("key", $this->key);
        $xml->addChild("value", $this->value);

        return $xml;
    }
Creates the XML representation of an attachment

@return \SimpleXMLElement