Tags fight with their content
We are not doing simple relational database: the relationship between the tag and what it says is complex
We sometimes say:
- it happened on <date value="1750-06-01">the first day of June</date>
But we more often say:
- It is not know for sure whether it happened on <date>the first day of June</date>
- For two hundred years people have wrongly believed that it happened on <date>the first day of June</date>
- Depending upon which calendar our sources were using, it either happened on <date>the first day of June</date> or on the <dateᡈth day of May</date>
We have attributes for all this: CERT, EXACT, etc.