Doctrine\OXM\Mapping\ClassMetadataInfo::getFieldXmlName PHP Method

    public function getFieldXmlName($fieldName)
    {
        if (!isset($this->fieldMappings[$fieldName])) {
            throw MappingException::mappingNotFound($this->name, $fieldName);
        }
        return isset($this->fieldMappings[$fieldName]) ? $this->fieldMappings[$fieldName]['name'] : null;
    }