[1]

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

External Web Resource
A Web Resource which is not part of the representation of the Annotation, such as a web page, image, or video. External Web Resources are dereferencable from their IRI.

[2] Web Annotation Data Model (2017-02-24 02:14:26 +09:00) https://w3c.github.io/web-annotation/model/wd2/#h-external-web-resources

[3]

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

External Web Resource
A Web Resource which is not part of the representation the selection, such as a web page, image, or video. External Web Resources are dereferencable from their IRI.