Making an update to an Annotation is as simple as POSTing JSON to the id of the annotation, containing the changed annotation.

However, you must provide the ETag using the If-Match header.

For example if we did a GET.

GET RESPONSE

HTTP/1.1 200 

ETag: W/“741c3b063c0345ce862a62cf429b2a4b” \<\<\<\< ETag HERE

Link: \<http://www.w3.org/ns/ldp\#Resource\>; rel="type"

Allow: PUT,GET,OPTIONS,HEAD,DELETE

Vary: Accept

Memento-Datetime: Sun, 20 May 2018 19:37:32 UTC \#\# IGNORE THIS FOR NOW

Content-Type: application/ld+json; profile="http://www.w3.org/ns/anno.jsonld";charset=UTF-8

Transfer-Encoding: chunked

Date: Sun, 20 May 2018 19:56:18 GMT

Connection: close

{

 "@context" : "http://www.w3.org/ns/anno.jsonld",

 "id" : "http://localhost:8080/annotation/w3c/my-container/foo-bar",

 "type" : "Annotation",

 "body" : {

 "type" : "TextualBody",

 "value" : "This one has a SLUG, so I know what id the annotation will have."

 },

 "target" : "http://www.example.com/index.html"

}

A PUT to update that annotation would look like

PUT

PUT /annotationw3c/my-container/ HTTP/1.1

Accept: application/ld+json; profile="http://www.w3.org/ns/anno.jsonld"

Content-Type: application/ld+json;

If-Match: 741c3b063c0345ce862a62cf429b2a4b

Host: localhost:8080

Connection: close

User-Agent: Paw/3.1.5 (Macintosh; OS X/10.13.4) GCDHTTPRequest

Content-Length: 281

{

 "@context": "http://www.w3.org/ns/anno.jsonld",

 "type": "Annotation",

 "body": {

 "type": "TextualBody",

 "value": "This one has a SLUG, so I know what id the annotation will have. And I have changed its content."

 },

 "target": "http://www.example.com/index.html"

}

RESPONSE

HTTP/1.1 200 

ETag: W/"3b6f03d78812a166ce6b43e415b58e29"

Link: \<http://www.w3.org/ns/ldp\#Resource\>; rel="type"

Link: \<http://localhost:8080/annotation/w3c/services/history/my-container/foo-bar/1\>; rel="prev memento"; datetime="Sun, 20 May 2018 19:37:32 UTC"

Allow: PUT,GET,OPTIONS,HEAD,DELETE

Vary: Accept

Memento-Datetime: Sun, 20 May 2018 20:01:04 UTC

Content-Type: application/ld+json; profile="http://www.w3.org/ns/anno.jsonld";charset=UTF-8

Transfer-Encoding: chunked

Date: Sun, 20 May 2018 20:01:05 GMT

Connection: close

{

 "@context" : "http://www.w3.org/ns/anno.jsonld",

 "id" : "http://localhost:8080/annotation/w3c/my-container/foo-bar",

 "type" : "Annotation",

 "body" : {

 "type" : "TextualBody",

 "value" : "This one has a SLUG, so I know what id the annotation will have. And I have changed its content."

 },

 "target" : "http://www.example.com/index.html"

}