1. CONTENTdm IIIF Discovery API
IIIF Technical Meeting - December 4, 2018
CONTENTdm IIIF Discovery API
Jeff Mixter
Lead Software Engineer
OCLC Research

2. CONTENTdm background 1600 CONTENTdm sites 14,471 Collections
14.4 Million Items

3. CONTENTdm IIIF background
14.4 Million IIIF Manifests
> 30 Million IIIF supported Images

4. OCLC IIIF Change Discovery API prototype
Built a Change Discovery API for all 14.4 Million CONTENTdm items using the current IIIF Change Discovery API v0.2 spec

5. How to use it Go to the endpoint and start harvesting!
The Change Discovery API has outlined a processing algorithm for reference
There is currently a 1 request per second throttle

6. "id": "https://researchworks.oclc.org/digital/discovery-index", { [
" ],
"id": "
"type": "OrderedCollection",
"summary": "This is a AS Collection of CDM Collection Change Discovery API OrderedCollections. This can be used as an Index of all CDM collection Change Discovery endpoints",
"total": 14471,
"context": [{
"id": "
"type": "Document",
"mediaType": "application/ld+json"
}],
"first": {
"id": "
"type": "OrderedCollectionPage" },
"last": {
"id": " }
Total number of CDM Collection Discovery API endpoints
Link to the first page of CDM Discovery API endpoints (500 per page)
On the landing page you will find a AS OrderedCollection of CONTENTdm OrderedCollections
You can parse data the same way you would parse IIIF Change Discovery API data

7. Reference to OrderedCollection{
@context: [
" ],
id: "
type: "OrderedCollectionPage",
partOf: {
id: "
type: "OrderedCollection" },
startIndex: 0,
next: {
id: "
orderedItems: [{
object: {
type: "OrderedCollection",
id: "
type: "Create",
endTime: " T10:51:37-04:00",
actor: {
type: "Organization",
id: " } …
Reference to OrderedCollection
Link to next page
Individual CONTENTdm Change Discovery endpoints can be harvested from the OrderedCollectionPage(s)
List of CDM Collection Discovery API endpoints

8. … Total number of Manifests in the collection{ [
" ],
"id": "
"type": "OrderedCollection",
"total": 1307,
"partOf": {
"id": "
"type": "OrderedCollection" },
"context": [{
"id": "
"type": "Document",
"mediaType": "application/ld+json"
}],
"first": {
"id": "
"type": "OrderedCollectionPage" …
Total number of Manifests in the collection
Link to CDM Site Change Discovery API endpoint
The collection OrdredCollection page is very similar to the API landing page

9. {
["
"id": "
"type": "OrderedCollection",
"total": ,
"context": [{
"id": "
"type": "Document",
"mediaType": "application/ld+json"
}],
"first": {
"id": "
"type": "OrderedCollectionPage" },
"last": {
"id": " }
Total number of Manifests for the CDM Site

10. … Link to collection Dataset Description (DCAT) { "@context": [
" ],
"id": "
"type": "OrderedCollection",
"total": 1307,
"partOf": {
"id": "
"type": "OrderedCollection" },
"context": [{
"id": "
"type": "Document",
"mediaType": "application/ld+json"
}],
"first": {
"id": "
"type": "OrderedCollectionPage" …
Link to collection Dataset Description (DCAT)
The collection OrdredCollection page is very similar to the API landing page

11. "description": "CONTENTdm collection FotosOC from site 21058", {
"landingPage": "
"description": "CONTENTdm collection FotosOC from site 21058",
"title": "Fons fotogràfic de l’Orfeó Català (Orfeó Català)", {
"title": "
"description": "
"landingPage": "
"Dataset": "
"id":
"type": },
"id": "
"type": "Dataset" }
DCAT Dataset description (very sparse right now)
This is a DCAT dataset description for the collection. It is obviously very sparse right now and something we hope to enhance/expand upon during the research project

12. … Link to first page of Manifests (50 per page) { "@context": [
" ],
"id": "
"type": "OrderedCollection",
"total": 1307,
"partOf": {
"id": "
"type": "OrderedCollection" },
"context": [{
"id": "
"type": "Document",
"mediaType": "application/ld+json"
}],
"first": {
"id": "
"type": "OrderedCollectionPage" …
The collection OrdredCollection page is very similar to the API landing page
Link to first page of Manifests (50 per page)

13. Link to collection OrderedCollection{
["
"id": "
"type": "OrderedCollectionPage",
"partOf": {
"id": "
"type": "OrderedCollection" },
"startIndex": 0,
"next": {
"id": "
"orderedItems": [{
"object": {
"type": "Manifest",
"id": "
"type": "Document",
"id": " }
"actor": {
"type": "Organization",
"id": "
"summary": "Manifest created",
"endTime": " T20:12:40-04:00",
"type": "Create",
"id": "
Link to collection OrderedCollection
Next page
Manifest URI
Date of the activity
Type of activity

14. Current Plans
Keep this service running in OCLC Research and help transition the work into CONTENTdm Production once it becomes version 1.0
Refresh the service with ‘Create’ activities every 2 weeks
Update the service as the IIIF Change Discovery API changes

15. Future plans
Enhance the Dataset descriptions with more interesting data
Subjects/topics
Descriptions
Refresh the service with ‘Update’ activities every 2 weeks
Develop harvester code that can used by the community