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Background: LDP and its mapping to Fedora objects
The LDP specification lays out the following concepts, interaction modes, and constraints on content:
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The issue at hand is whether Fedora should support the LDP construct of an RDF source that is not also a container (LDP-RS-NC), and how such an resource in LDP would map to a concept in Fedora.
Proposal: Fedora container object with a child resource at a specified path redirecting to external content
Request 1: create container object
LDP to Fedora mapping
| LDP Concept | Fedora Concept | LDP Interaction Modes | Constraints on Content |
|---|---|---|---|
| LDPC | Object | LDPC, LDP-RS | RDF, must contain LDP membership triples, subjects must be repository objects, subjects must be the URI of the object |
| LDP-NR | Datastream | LDPR, LDP-NR | none |
| LDP-RS-NC | - | - | - |
Note that this proposal maintains the current behaviour in that LDP-RS-NC is not supported.
Request 1: create container object
| Code Block | ||
|---|---|---|
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curl -i -X | ||
| Code Block | ||
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curl -i -X PUT "http://localhost:8080/rest/my_external_datastream_obj"
HTTP/1.1 201 Created
ETag: "f93bbf77fee0fa16da4872102a54240e7135eaf2"
Last-Modified: Thu, 12 Mar 2015 20:56:08 GMT
Content-Length: 53
Location: http://localhost:8080/rest/my_external_datastream_obj
Content-Type: text/plain
Server: Jetty(8.1.12.v20130726)
curl -H "Accept: text/turtle" "http://localhost:8080/rest/my_external_datastream_obj"
<http://localhost:8080/rest/my_external_datastream_obj> a ldp:RDFSource , ldp:Container , <http://www.jcp.org/jcr/nt/1.0folder> , <http://www.jcp.org/jcr/nt/1.0hierarchyNode> , <http://www.jcp.org/jcr/nt/1.0base> , <http://www.jcp.org/jcr/mix/1.0created> , fedora:Container , fedora:Resource , fedora:Resource , <http://www.jcp.org/jcr/mix/1.0created> , <http://www.jcp.org/jcr/mix/1.0lastModified> , <http://www.jcp.org/jcr/mix/1.0referenceable> ;
fedora:lastModifiedBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:uuid "fe7a8497-d826-490d-a786-ba601e039055"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:createdBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:primaryType "nt:folder"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:created "2015-03-12T20:56:08.468Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
fedora:mixinTypes "fedora:Container"^^<http://www.w3.org/2001/XMLSchema#string> , "fedora:Resource"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:lastModified "2015-03-12T20:56:08.468Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
fedora:hasParent <http://localhost:8080/rest/> ;
fedora:exportsAs <http://localhost:8080/rest/my_external_datastream_obj/fcr:export?format=jcr/xml> .
<http://localhost:8080/rest/my_external_datastream_obj/fcr:export?format=jcr/xml> dc:format <http://fedora.info/definitions/v4/repository#jcr/xml> .
<http://fedora.info/definitions/v4/repository#jcr/xml> rdfs:label "jcr/xml"^^<http://www.w3.org/2001/XMLSchema#string> . |
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| Code Block | ||
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curl -H "Accept: text/turtle" -H "Prefer: return=representation; include=\"http://fedora.info/definitions/v4/repository#EmbedResources\";" "http://localhost:8080/rest/my_external_datastream_obj"
<http://localhost:8080/rest/my_external_datastream_obj> a ldp:RDFSource , ldp:Container , <http://www.jcp.org/jcr/nt/1.0folder> , <http://www.jcp.org/jcr/nt/1.0hierarchyNode> , <http://www.jcp.org/jcr/nt/1.0base> , <http://www.jcp.org/jcr/mix/1.0created> , fedora:Container , fedora:Resource , fedora:Resource , <http://www.jcp.org/jcr/mix/1.0created> , <http://www.jcp.org/jcr/mix/1.0lastModified> , <http://www.jcp.org/jcr/mix/1.0referenceable> ;
fedora:lastModifiedBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:uuid "fe7a8497-d826-490d-a786-ba601e039055"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:createdBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:primaryType "nt:folder"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:created "2015-03-12T20:56:08.468Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
fedora:mixinTypes "fedora:Container"^^<http://www.w3.org/2001/XMLSchema#string> , "fedora:Resource"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:lastModified "2015-03-12T21:08:33.787Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
fedora:hasParent <http://localhost:8080/rest/> ;
ldp:contains <http://localhost:8080/rest/my_external_datastream_obj/extds> .
<http://localhost:8080/rest/my_external_datastream_obj/extds> a <http://www.jcp.org/jcr/nt/1.0resource> , <http://www.jcp.org/jcr/nt/1.0base> , <http://www.jcp.org/jcr/mix/1.0mimeType> , <http://www.jcp.org/jcr/mix/1.0lastModified> , fedora:Binary , fedora:Resource , <http://www.jcp.org/jcr/mix/1.0created> , <http://www.jcp.org/jcr/mix/1.0lastModified> , <http://www.jcp.org/jcr/mix/1.0referenceable> ;
fedora:lastModifiedBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:uuid "86aa4107-768d-4e2d-9064-78be072c0888"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:mimeType "message/external-body; access-type=URL; url=\"http://en.wikipedia.org/wiki/File:Harry_Whittier_Frees_-_What%27s_Delaying_My_Dinner.jpg\""^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:digest <urn:sha1:da39a3ee5e6b4b0d3255bfef95601890afd80709> ;
premis:hasSize "0"^^<http://www.w3.org/2001/XMLSchema#long> ;
fedora:createdBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:primaryType "nt:resource"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:created "2015-03-12T21:08:33.787Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
fedora:mixinTypes "fedora:Binary"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:lastModified "2015-03-12T21:08:33.787Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
premis:hasOriginalName ""^^<http://www.w3.org/2001/XMLSchema#string> .
<http://localhost:8080/rest/my_external_datastream_obj> fedora:exportsAs <http://localhost:8080/rest/my_external_datastream_obj/fcr:export?format=jcr/xml> .
<http://localhost:8080/rest/my_external_datastream_obj/fcr:export?format=jcr/xml> dc:format <http://fedora.info/definitions/v4/repository#jcr/xml> .
<http://fedora.info/definitions/v4/repository#jcr/xml> rdfs:label "jcr/xml"^^<http://www.w3.org/2001/XMLSchema#string> . |
LDP to Fedora mapping
| LDP Concept | Fedora Concept | LDP Interaction Modes | Constraints on Content |
|---|---|---|---|
| LDPC | Object | LDPC, LDP-RS | RDF, must contain LDP membership triples, subjects must be repository objects, subjects must be the URI of the object |
| LDP-NR | Datastream | LDPR, LDP-NR | none |
| LDP-RS-NC | - | - | - |
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Proposal: LDP-RS as datastreams
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