The implementations differ.
We have been looking primarily at Wikis, not articles, and the d-tag doesn't appear to be an identifier and doesn't contain any unique ID in the event. It looked, to me, like it's a topic description.
Example:
https://njump.me/naddr1qvzqqqrcvgpzphtxf40yq9jr82xdd8cqtts5szqyx5tcndvaukhsvfmduetr85ceqyw8wumn8ghj7argv43kjarpv3jkctnwdaehgu339e3k7mf0qqrrxtt2da5xuk69zjt