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- LDPR: Linked Data Platform Resource
- LDPC: Linked Data Platform Container
To what extent can/should this class of objects be modeled as LDPRs not contained within a LDPC?
What are the benefits of such a model?
What are the drawbacks or limitations?
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Proposal: Fedora container object with a child resource at a specified path redirecting to external content
Request 1: create container object
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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> . |
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Proposal: LDP-RS as datastreams
This strawman proposal addresses the following issues:
- Allow Fedora to create LDP-RS (RDF resources) that are NOT containers (LDPC), as allowed per the LDP spec. These will henceforth be called LDP-RS-NCs ("LDP RDF Source, Non-containers") for the sake of this discussion
- Allow the LDP-RS-NCs created by Fedora to contain arbitrary RDF
- No requirements on allowable subjects, predicates, or objects in the triples
- No constraints on constructs such as blank nodes
- Allow the LDP-RS-NCs created to by Fedora to be 'pure' in that they are logically unmodified from client requests
- No server managed triples are added by Fedora
- Allow the LDP-RS interaction model as defined by LDP on these resources
- Retrieve triples in specified representation (xml, turtle, ntriples, etc)
- Logical PUT operation (i.e. logical contents of graph are stored, not necessarily the serialization bytes)
- SPARQL Update semantics (PATCH)
- Interpretation of relative URIs as per the LDP spec (for example, allowing null relative URIs "<>" to refer to the to-be-created resource URI)
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Specifics:
LDP-RS-NCs in Fedora shall be datastreams, differing only from binary datastreams (exposed as LDP-NRs in LDP) in the following significant ways:
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An LDP-RS-NC shall be created when the client specifies an LDPR interaction model for newly created resources as per section 5.2.3.4 of the LDP spec.
Proposal: "Pointlike objects"
In this view, LDP-RS-NCs appear in the repository as objects without datastreams or contained objects. They would possess all the functions of other objects, except that attempts to add children to them (datastreams or child objects) would fail under all circumstances. They could support the interaction described in section 5.2.3.4 of the LDP specification, if a client so specifies in the appropriate way when creating one. Their serializations would be no different from those of any other object, nor would they offer a special binary representation of any kind, other than as provided for by any object in the repository.