Introduction to Structured Data
google 結構化資料測試工具
https://search.google.com/structured-data/testing-tool?hl=zh-TW
https://developers.google.com/search/docs/guides/intro-structured-data?visit_id=1-636661813787436078-1161428368&rd=1
schema.org
範例：https://search.google.com/structured-data/testing-tool?hl=de#url=http%3A%2F%2Fwww.usa-reisetipps.net%2Feinreise-usa%2Festa-visum
