[1]

Web Annotation Data Model (2017-02-24 02:14:26 +09:00) https://w3c.github.io/web-annotation/model/wd2/#dfn-instance

Instance
An element of a group of Resources represented by a particular Class.

[2]

Selectors and States (2017-02-24 02:14:26 +09:00) https://w3c.github.io/web-annotation/selector-note/#dfn-instance

Instance
An element of a group of Resources represented by a particular Class.