Doctrine\OXM\Marshaller\XmlMarshaller::writeAttribute PHP Method

    private function writeAttribute(WriterHelper $writer, ClassMetadata $classMetadata, $fieldName, $fieldValue)
    {
        $name = $classMetadata->getFieldXmlName($fieldName);
        $type = $classMetadata->getTypeOfField($fieldName);
        $mapping = $classMetadata->getFieldMapping($fieldName);
        $prefix = isset($mapping['prefix']) ? $mapping['prefix'] : null;
        if ($classMetadata->isCollection($fieldName)) {
            $convertedValues = array();
            foreach ($fieldValue as $value) {
                $convertedValues[] = Type::getType($type)->convertToXmlValue($value);
            }
            $writer->writeAttribute($name, implode(" ", $convertedValues), $prefix);
        } else {
            $writer->writeAttribute($name, Type::getType($type)->convertToXmlValue($fieldValue), $prefix);
        }
    }