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This guide is designed to describe the details of both LDP and PCDM in the context of F4 by walking through a simple example of a single collection, consisting of a single book that implements page ordering.
Note:
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| title | 0: Final State - Complete |
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This diagram depicts the logical structure of resources and relationships of a collection ("poe") that consists of a book ("raven") that consists of three pages that are ordered. 
The following steps will walk through the process of creating this structure from the ground up.
The different types of LDP containers and sources will be detailed, as well as the PCDM types and relationships in the steps below. |
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| title | Cover - Create Files |
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Once again, we demonstrate the use of LDP in creating PCDM relationships simply as a result of repository interactions. 
Add two pcdm:File resources to the DirectContainer, "files/" as follows:
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curl -i -XPUT -H"Content-Type: image/jpeg" --data-binary @cover.jpg localhost:8080/rest/objects/raven/pages/cover/files/cover.jpg |
Where "cover.jpg" is attached. If you perform a subsequent HTTP HEAD on this new resource, you will see there is a "Link" header of rel="describedby". Update the RDF metadata of the ldp:NonRdfSource to specify that the resource is a pcdm:File, as follows: | Code Block |
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curl -i -XPATCH -H"Content-Type: application/sparql-update" --data-binary @pcdm-file.ru localhost:8080/rest/objects/raven/pages/cover/files/cover.jpg/fcr:metadata |
Where "pcdm-file.ru" follows: | Code Block |
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| PREFIX pcdm: <http://pcdm.org/models#>
INSERT {
<> a pcdm:File
} WHERE {
} |
Repeat for the attached TIFF, cover.tif | Code Block |
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curl -i -XPUT -H"Content-Type: image/tiff" --data-binary @cover.tif localhost:8080/rest/objects/raven/pages/cover/files/cover.tif
curl -i -XPATCH -H"Content-Type: application/sparql-update" --data-binary @pcdm-file.ru localhost:8080/rest/objects/raven/pages/cover/files/cover.tif/fcr:metadata |
After creating the two "cover" resources, an HTTP GET on "cover/" will include the two new triples: | No Format |
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<http://localhost:8080/rest/objects/raven/pages/cover/> pcdm:hasFile <http://localhost:8080/rest/objects/raven/pages/cover/files/cover.jpg>
<http://localhost:8080/rest/objects/raven/pages/cover/> pcdm:hasFile <http://localhost:8080/rest/objects/raven/pages/cover/files/cover.tif> |
Once again, - the subject of the triple comes from the "ldp:membershipResource" defined on "files/"
- the predicate of the triple comes from the "ldp:hasMemberRelation" defined on "files/", and
- the object of the triple is the new resource ("cover.jpg" or "cover.tif") that was added to the ldp:DirectContainer ("files/")
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| title | Page0 - Create DirectContainer |
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Here we repeat the exact steps as for the "cover/" above, but for "page0".  Image Added
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curl -i -XPUT -H"Content-Type: text/turtle" --data-binary @ldp-cover-direct.ttl localhost:8080/rest/objects/raven/pages/cover/files/ |
Where "ldp-page0-direct.ttl" follows: | Code Block |
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| title | ldp-page0-direct.ttl |
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| @prefix ldp: <http://www.w3.org/ns/ldp#>
@prefix pcdm: <http://pcdm.org/models#>
<> a ldp:DirectContainer, pcdm:Object ;
ldp:membershipResource </rest/objects/raven/pages/page0/> ;
ldp:hasMemberRelation pcdm:hasFile . |
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| title | Page0 - Create Files |
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Here we add the attached page0 files (page0.jpg and page0.tif) to the newly created DirectContainer.  Image Added
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curl -i -XPUT -H"Content-Type: image/jpeg" --data-binary @page0.jpg localhost:8080/rest/objects/raven/pages/page0/files/page0.jpg
curl -i -XPUT -H"Content-Type: image/tiff" --data-binary @page0.tif localhost:8080/rest/objects/raven/pages/page0/files/page0.tif |
Followed by assigning the type of pcdm:File to the respective RDF Sources found in the "Link; rel=describedby" header of each of the ldp:NonRdfSources. | Code Block |
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curl -i -XPATCH -H"Content-Type: application/sparql-update" --data-binary @pcdm-file.ru localhost:8080/rest/objects/raven/pages/page0/files/page0.jpg/fcr:metadata
curl -i -XPATCH -H"Content-Type: application/sparql-update" --data-binary @pcdm-file.ru localhost:8080/rest/objects/raven/pages/page0/files/page0.tif/fcr:metadata |
Where "pcdm-file.ru" follows: | Code Block |
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| PREFIX pcdm: <http://pcdm.org/models#>
INSERT {
<> a pcdm:File
} WHERE {
} |
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| title | 2: Final State - Collection |
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