add notBefore and notAfter attributes to <date> element

dracor-org / dracor-schema

ODD and schemas for dracor.org files

https://dracor.org/doc/odd

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Closed lehkost closed 3 years ago

lehkost commented 4 years ago

This is already parsed by the DraCor frontend and needs to be added to the schema:

Example (from here):

<date type="written" notBefore="1756" notAfter="1757">1756–1757</date>