<https://www.cybertrust.co.jp/blog/linux-oss/system-monitoring/tech-lounge/zbx-tl-018-acknowledgement.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.cybertrust.co.jp/blog/linux-oss/system-monitoring/tech-lounge/zbx-tl-018-acknowledgement.html>