(a URI). The target can be identified by an URI (e.g., fragment identifiers) and/or a selector that defines a domain-, resource- or application-specific access protocol, e.g., offset-based, XPath-based, etc.

Web Annotation was standardized on February 23, 2017 with the release of three official Recommendations by the W3C Web Annotation Working Group:

* Web Annotation Data Model
* Web Annotation Vocabulary
* Web Annotation Protocol

These recommendations were accompanied by additional working group notes

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