Thanks for spotting these license=* tags. A more descriptive key is probably warranted, since ref:license=* isn’t used anywhere else, but we’ll have to consult with the local community on the exact key to use.

Technically, these numbers are the numbers of decisions by local governing bodies. “SYT-GPHĐ” stands for “Sở Y tế – giấy phép hoạt động” (Health Department – operating license), while “CT-CCHN” stands for “Cần Thơ – chứng chỉ hành nghề” (Can Tho province – practicing certificate). It’s typical for any decision/law/license number to contain a slash followed by a descriptor of this sort.