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Excerpt |
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This page provides detailed steps for creating repository content via the REST API, and SPARQL queries to demonstrate that content has been synchronized to an external triplestore. For more details on setting up triplestore sync, see External Triplestore. Much more information about the REST API is available at: RESTful HTTP API and Another Take on the REST API . |
1. Finding
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Containers by
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Binary Name or MIME Type
Create a few sample objects containers with either a PDF or a text file, or both attached as datastreams binaries (the following commands assume you have two files named test.pdf and test.txt in your current working directory; please substitute working filenames as needed):
Code Block |
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title | File: objectcontainer-indexing.rdf |
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PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX indexing: <http://fedora.info/definitions/v4/indexing#>
DELETE { }
INSERT {
<> indexing:hasIndexingTransformation "default";
rdf:type indexing:indexable }
WHERE { } |
Code Block |
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language | bash |
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title | 1a. Creating Sample ObjectsContainers |
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curl -X PUT "http://localhost:8080/rest/objects/101"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/101"
curl -X PUT -H "Content-type: application/pdf" --data-binary "@test.pdf" "http://localhost:8080/rest/objects/101/master"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/101/master/fcr:metadata"
curl -X PUT "http://localhost:8080/rest/objects/102"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/102"
curl -X PUT -H "Content-type: text/plain" --data-binary "@test.txt" "http://localhost:8080/rest/objects/102/master"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/102/master/fcr:metadata"
curl -X PUT "http://localhost:8080/rest/objects/103"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/103"
curl -X PUT -H "Content-type: application/pdf" --data-binary "@test.pdf" "http://localhost:8080/rest/objects/103/master"
curl -X PUT -H "Content-type: text/plain" --data-binary "@test.txt" "http://localhost:8080/rest/objects/103/text"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/103/master/fcr:metadata"
curl -X PATCH -H "Content-type: application/sparql-update" --data-binary "@object-indexing.rdf" "http://localhost:8080/rest/objects/103/text/fcr:metadata" |
Find objects containers with a datastream binary named "text":
Code Block |
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language | sql |
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title | 1b. Selecting Objects Containers With Datastreams Binaries Named "text" |
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prefix fcrepo: <http://fedora.info/definitions/v4/repository#>
select ?object where {
?ds fcrepo:mixinTypes "fedora:NonRdfSourceDescription" .
?ds fcrepo:hasParent ?object .
filter(str(?ds)=concat(str(?object),'/text/fcr:metadata'))
} |
Expected Results
objectcontainer |
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<http://localhost:8080/rest/objects/103> |
Find objects containers with a PDF datastreambinary:
Code Block |
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language | sql |
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title | 1c. Selecting Objects Containers With PDF DatastreamsBinaries |
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prefix fcrepo: <http://fedora.info/definitions/v4/repository#>
prefix relation: <http://www.iana.org/assignments/relation/>
select ?object where {
?ds fcrepo:mixinTypes "fedora:NonRdfSourceDescription" .
?ds fcrepo:hasParent ?object .
?ds relation:describes ?content .
?content fcrepo:mimeType "application/pdf"
} |
Expected Results
objectcontainer |
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<http://localhost:8080/rest/objects/101> |
<http://localhost:8080/rest/objects/103> |
2. Attach metadata properties directly to
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containers
Create an object container and attach the dc:title property:
Code Block |
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language | bash |
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title | 2a. Creating Sample ObjectsContainers |
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curl -X PUT http://localhost:8080/rest/objects/201
echo "prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> prefix index: <http://fedora.info/definitions/v4/indexing#> insert data { <> rdf:type index:indexable . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/201
echo "prefix dc: <http://purl.org/dc/elements/1.1/> insert data { <http://localhost:8080/rest/objects/201> dc:title 'Foo' . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/201 |
Find objects containers with titles:
Code Block |
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language | sql |
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title | 2b. Selecting Objects Containers With Titles |
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prefix dc: <http://purl.org/dc/elements/1.1/>
select ?object ?title where { ?object dc:title ?title } |
Expected Results
object container | title |
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<http://localhost:8080/rest/objects/201> | "Foo" |
3. Find
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Containers By Collection Membership
Create three objects containers and three collections:
Code Block |
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language | bash |
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title | 3a. Creating Sample Objects Containers And Collections |
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curl -X PUT http://localhost:8080/rest/objects/col1
curl -X PUT http://localhost:8080/rest/objects/col2
curl -X PUT http://localhost:8080/rest/objects/col3
curl -X PUT http://localhost:8080/rest/objects/obj1
curl -X PUT http://localhost:8080/rest/objects/obj2
curl -X PUT http://localhost:8080/rest/objects/obj3 |
Mark the objects containers indexable:
Code Block |
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language | bash |
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title | 3b. Marking objects containers indexable |
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echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj1
echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj2
echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj3
echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col1
echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col2
echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col3 |
Link each object container to a collection:
Code Block |
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language | bash |
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title | 3c. Linking Objects Containers To Collections |
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echo 'insert data { <http://localhost:8080/rest/objects/obj1> <http://some-vocabulary.org/rels-ext#isMemberOfCollection> <http://localhost:8080/rest/objects/col1> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj1
echo 'insert data { <http://localhost:8080/rest/objects/obj2> <http://some-vocabulary.org/rels-ext#isMemberOfCollection> <http://localhost:8080/rest/objects/col2> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj2
echo 'insert data { <http://localhost:8080/rest/objects/obj3> <http://some-vocabulary.org/rels-ext#isMemberOfCollection> <http://localhost:8080/rest/objects/col3> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj3
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Code Block |
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language | bash |
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title | 3d. Linking Collections In A Hierarchy |
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echo 'insert data { <http://localhost:8080/rest/objects/col1> <http://some-vocabulary.org/rels-ext#hasPart> <http://localhost:8080/rest/objects/col2> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col1
echo 'insert data { <http://localhost:8080/rest/objects/col2> <http://some-vocabulary.org/rels-ext#hasPart> <http://localhost:8080/rest/objects/col3> . }' | curl -X PATCH --upload-file - http://localhost:8080/rest/objects/col2 |
Find objects containers directly attached to a collection:
Code Block |
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language | sql |
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title | 3e. Selecting Objects Containers Directly Linked To A Collection |
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select ?obj ?col where { ?obj <http://some-vocabulary.org/rels-ext#isMemberOfCollection> ?col } |
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obj | col |
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<http://localhost:8080/rest/objects/obj1> | <http://localhost:8080/rest/objects/col1> |
<http://localhost:8080/rest/objects/obj2> | <http://localhost:8080/rest/objects/col2> |
<http://localhost:8080/rest/objects/obj3> | <http://localhost:8080/rest/objects/col3> |
Find
objects containers directly or indirectly attached (recursive retrieval along the rels:hasPart chain). Applications developed using Fedora 3 may use
Mulgara's walk() function for queries that navigate a hierarchy. That functionality is now part of standard
SPARQL 1.1 (
Jena's property paths documentation provides some good examples).
Code Block |
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language | sql |
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title | 3f. Select Objects Containers Directly Or Indirectly Linked To A Collection |
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prefix rels: <http://some-vocabulary.org/rels-ext#>
select ?obj where {
<http://localhost:8080/rest/objects/col1> rels:hasPart* ?col
. ?obj rels:isMemberOfCollection ?col
} |
Expected Results
objcontainers |
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<http://localhost:8080/rest/objects/obj1> |
<http://localhost:8080/rest/objects/obj2> |
<http://localhost:8080/rest/objects/obj3> |
Also link an object a container to a project:
Code Block |
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language | bash |
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title | 3g. Link Objects Containers To A Project |
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curl -X PUT http://localhost:8080/rest/objects/proj1
echo "insert data { <> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://fedora.info/definitions/v4/indexing#indexable> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/proj1
echo "prefix ex: <http://example.org/> insert data { <http://localhost:8080/rest/objects/obj1> ex:project <http://localhost:8080/rest/objects/proj1> . }" \
| curl -X PATCH --upload-file - http://localhost:8080/rest/objects/obj1 |
Find objects containers in a collection or linked to a project:
Code Block |
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language | sql |
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title | 3h. Select Objects Containers Linked To A Collection or A Project |
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prefix rels: <http://some-vocabulary.org/rels-ext#>
prefix ex: <http://example.org/>
select ?obj where {
{ ?obj ex:project <http://localhost:8080/rest/objects/proj1> }
UNION
{ ?obj rels:isMemberOfCollection <http://localhost:8080/rest/objects/col2> }
} |
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obj |
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<http://localhost:8080/rest/objects/obj1> |
<http://localhost:8080/rest/objects/obj2> |
Count objects containers instead of listing them:
Code Block |
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language | sql |
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title | 3i. Count the Objects Containers Linked to a Collection or a Project |
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prefix rels: <http://some-vocabulary.org/rels-ext#>
prefix ex: <http://example.org/>
select (count(distinct ?obj) as ?count) where {
{ ?obj ex:project <http://localhost:8080/rest/objects/proj1> }
UNION
{ ?obj rels:isMemberOfCollection <http://localhost:8080/rest/objects/col2> }
} |
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