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103 lines
3.4 KiB
Text
103 lines
3.4 KiB
Text
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```{index} Linked Data; Platform
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```
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# Linked Data Platform
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```{index} Containers
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```
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## Containers
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https://www.w3.org/TR/ldp/#ldpc
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We extend the notion of LDP containers!
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Terms:
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- Containment Triples
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- Membership Triples
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Types:
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- Direct Containers
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```turtle
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@prefix dcterms: <http://purl.org/dc/terms/>.
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@prefix ldp: <http://www.w3.org/ns/ldp#>.
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<http://example.org/c1/>
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a ldp:BasicContainer;
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dcterms:title "A very simple container";
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ldp:contains <r1>, <r2>, <r3>.
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```
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- Indirect Containers - a way of interacting with existing data
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Given:
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```turtle
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@prefix ldp: <http://www.w3.org/ns/ldp#>.
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@prefix o: <http://example.org/ontology#>.
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<http://example.org/netWorth/nw1/>
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a o:NetWorth;
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o:netWorthOf <http://example.org/users/JohnZSmith>;
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o:asset
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<assets/a1>,
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<assets/a2>;
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o:liability
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<liabilities/l1>,
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<liabilities/l2>,
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<liabilities/l3>.
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```
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we can make direct containers that describe the assets and liabilities as containers without modifying the original data
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```turtle
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@prefix ldp: <http://www.w3.org/ns/ldp#>.
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@prefix dcterms: <http://purl.org/dc/terms/>.
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@prefix o: <http://example.org/ontology#>.
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<http://example.org/netWorth/nw1/assets/>
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a ldp:DirectContainer;
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dcterms:title "The assets of JohnZSmith";
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ldp:membershipResource <http://example.org/netWorth/nw1/>;
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ldp:hasMemberRelation o:asset;
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ldp:contains <a1>, <a2>.
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```
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Additionally, if one were to add a new set of "advisors," we would make an indirect container that tells us we need an additional triple when creating new members of the container (`foaf:primaryTopic`):
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```turtle
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<advisors/>
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a ldp:IndirectContainer;
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dcterms:title "The asset advisors of JohnZSmith";
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ldp:membershipResource <>;
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ldp:hasMemberRelation o:advisor;
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ldp:insertedContentRelation foaf:primaryTopic;
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ldp:contains
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<advisors/bob>, # URI of a document a.k.a. an information resource
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<advisors/marsha>. # describing a person
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```
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(still unclear to me what is different about that, still reading.)
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| Completed Request | Membership Effect | Containment Effect |
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| ----------------- | ------------------- | ------------------ |
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| Create in Basic Container | New triple: (LDPC, ldp:contains, LDPR) | Same
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| Create in Direct Container | New triple links LDP-RS to created LDPR. LDP-RS URI may be same as LDP-DC | New triple: (LDPC, ldp:contains, LDPR) |
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| Create in Indirect Container | New triple links LDP-RS to content indicated URI | New triple: (LDPC, ldp:contains, LDPR) |
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| Resource deleted | Membership triple may be removed | (LDPC, ldp:contains, LDPR) triple is removed |
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| Container deleted | Triples and member resources may be removed | Triples of form (LDPC, ldp:contains, LDPR) and contained LDPRs may be removed |
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## Similarities
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- Separation between container data and metadata - "minimal-container triples," what remains in the container when the container has zero members and zero contained resources
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## Differences
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- Containers are not recursive??or at least that is suggested by the 'net worth' example that explains why we can't just turn the original subject into a container: "can't mix assets and liabilities" and i am like why not make one container for the person and then subcontainers for each of the types?
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## References
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- Spec: https://www.w3.org/TR/ldp/
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- Use cases and requirements: https://www.w3.org/TR/ldp-ucr/
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- eg. using virtuoso. https://github.com/vemonet/virtuoso-ldp
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