Activity Streams is an open format specification for activity stream protocols, which are used to syndicate activities taken in social web applications and services, similar to those in Facebook's, Instagram's, and Twitter's. The standard provides a general way to represent activities.

Prefix
ac
Links
Homepage
Contact
Missing Contact
Pattern
Missing Pattern
Example Identifier
Add   Resolve
Providers

Providers are various services that resolve CURIEs to URLs. The example CURIE ac:Add is used to demonstrate the provides available for ac. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URL
Activity Streams ac http://www.w3.org/ns/activitystreams#Add
Bioregistry bioregistry https://bioregistry.io/ac:Add