Pagination for LWS Containers

lws10-core/container-representation.md

@@ -8,8 +8,11 @@ A container representation MUST include the following properties:
 
 - **`id`**: The URI of the container.
 - **`type`**: The value `"Container"`.
-- **`totalItems`**: An integer indicating the total number of resources contained in the container which can be disclosed to the client.
-- **`items`**: An array of contained resource descriptions (see below). If the container is empty, this MUST be an empty array.
+- **`totalItems`**: An integer indicating the total number of resources
+ contained in the container which can be disclosed to the client.
+- **`items`**: An array of contained resource descriptions (see below). If the 
+  container is empty, this MUST be an empty array. When the container listing is
+  paginated, `items` contains only the current page of resources; see [Pagination](#pagination) for details.
 
 #### Contained Resource Description
 

lws10-core/lws-media-type.md

@@ -13,3 +13,127 @@ Servers MUST support content negotiation for container representations. The resp
 - If a client requests `application/json`, the server MUST respond with `Content-Type: application/json`.
 
 In all three cases, the response body is the same JSON-LD document conforming to the LWS container vocabulary. Servers are free to support additional media types (e.g., `text/turtle`) through content negotiation.
+
+
+#### Pagination
+
+Certain composite resources, like containers, may hold a large number of resources. 
+To allow clients to retrieve listings incrementally, servers SHOULD support
+pagination for containers whose membership exceeds a server-determined threshold.
+
+##### Pagination Model
+
+Pagination is link-based: the server provides pagination URIs via HTTP `Link` headers [[!RFC8288]],
+allowing clients to navigate the full listing without relying on numeric offsets.
+
+When a listing is paginated, the response body contains only the current page of items. The
+composite resource's `id`, `type`, and `totalItems` properties reflect the full membership, while `items`
+contains only the resources on the current page.
+
+##### Pagination Link Relations
+
+Pagination URIs are conveyed in `Link` headers using the following standard link relations:
+
+- **`rel="first"`**: The URI of the first page of results. MUST be present on paginated responses.
+- **`rel="last"`**: The URI of the last page of results. MAY be present on paginated responses.
+- **`rel="next"`**: The URI of the next page of results. MUST be present when there are subsequent
+pages. MUST be omitted on the last page.
+- **`rel="prev"`**: The URI of the previous page of results. MAY be present when there are preceding
+pages. MUST be omitted on the first page.
+
+All pagination URIs are opaque to the client. Clients SHOULD NOT construct or modify pagination
+URIs; they SHOULD use the URIs provided by the server.
+
+##### Requesting Pages
+
+A client requests the composite resource's URI to obtain the first page. The response includes pagination
+Link headers that the client follows to retrieve subsequent pages. Servers MAY also support
+direct access to specific pages via the pagination URIs obtained during a previous scan.
+
+When a paginated response is returned, the server MUST respond with 200 OK. The `totalItems`
+property in the response body MUST reflect the total number of items across all pages, not just the
+current page.
+
+##### Example: Paginated Container
+
+Request:
+```
+GET /alice/photos/ HTTP/1.1
+Authorization: Bearer <token>
+Accept: application/lws+json
+```
+
+Response (first page):
+```
+HTTP/1.1 200 OK
+Content-Type: application/lws+json
+ETag: "photos-page1-etag"
+Link: </alice/photos/.meta>; rel="linkset"; type="application/linkset+json"
+Link: </alice/>; rel="up"
+Link: </alice/photos/.acl>; rel="acl"
+Link: <https://www.w3.org/ns/lws#Container>; rel="type"
+Link: </alice/photos/?page=1>; rel="first"
+Link: </alice/photos/?page=3>; rel="last"
+Link: </alice/photos/?page=2>; rel="next"
+
+{
+  "@context": "https://www.w3.org/ns/lws/v1",
+  "id": "/alice/photos/",
+  "type": "Container",
+  "totalItems": 150,
+  "items": [
+    {
+      "type": "DataResource",
+      "id": "/alice/photos/vacation.jpg",
+      "mediaType": "image/jpeg",
+      "size": 248392,
+      "modified": "2025-11-20T10:30:00Z"
+    },
+    {
+      "type": "DataResource",
+      "id": "/alice/photos/portrait.png",
+      "mediaType": "image/png",
+      "size": 102400,
+      "modified": "2025-11-21T14:15:00Z"
+    }
+  ]
+}
+```
+
+Request (next page):
+```
+GET /alice/photos/?page=2 HTTP/1.1
+Authorization: Bearer <token>
+Accept: application/lws+json
+```
+
+Response (middle page):
+```
+HTTP/1.1 200 OK
+Content-Type: application/lws+json
+ETag: "photos-page2-etag"
+Link: </alice/photos/.meta>; rel="linkset"; type="application/linkset+json"
+Link: </alice/>; rel="up"
+Link: </alice/photos/.acl>; rel="acl"
+Link: <https://www.w3.org/ns/lws#Container>; rel="type"
+Link: </alice/photos/?page=1>; rel="first"
+Link: </alice/photos/?page=1>; rel="prev"
+Link: </alice/photos/?page=3>; rel="next"
+Link: </alice/photos/?page=3>; rel="last"
+
+{
+  "@context": "https://www.w3.org/ns/lws/v1",
+  "id": "/alice/photos/",
+  "type": "Container",
+  "totalItems": 150,
+  "items": [
+    {
+      "type": "DataResource",
+      "id": "/alice/photos/sunset.jpg",
+      "mediaType": "image/jpeg",
+      "size": 315000,
+      "modified": "2025-11-22T09:00:00Z"
+    }
+  ]
+}
+```