Tag URI scheme
The definition of the scheme identifies four requirements for tags:
- Identifiers are likely to be unique across space and time, and come from a practically inexhaustible supply.
- Identifiers are relatively convenient for humans to mint (create), read, type, remember etc.
- No central registration is necessary, at least for holders of domain names or email addresses; and there is negligible cost to mint each new identifier.
- The identifiers are independent of any particular resolution scheme.— Hawke and Kindberg, The 'tag' URI Scheme
The following example shows a tag that could indicate the authorship of a resource on the World Wide Web. The semantics of tags do not require the user to have current ownership of the hostname upon which the tag is based, but only have had it at the date specified within the tag.
A similar tag could indicate the name of a pet belonging to the same individual. The semantics of tags do not require the tagged entity to be accessible electronically.
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