Documentation: dcterms prefixed used but not defined

Created on 29 Jan 2020 · 8Comments · Source: Islandora/documentation

The dcterms prefix is used in the islandora_defaults for the rdf mapping, but the prefix name itself is never explicitly defined. This results in fedora thinking that things like "dcterms:spacial" is a full URL:

``` @prefix rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns# .
@prefix fedora: http://fedora.info/definitions/v4/repository# .
@prefix ldp: http://www.w3.org/ns/ldp# .
@prefix dcterms: http://purl.org/dc/terms/ .

http://127.0.0.1:8080/fcrepo/rest/31/40/3c/9f/31403c9f-e64c-4e3e-823c-ec4b80f4db1f
rdf:type fedora:Container ;
rdf:type http://purl.org/coar/resource_type/c_c513 ;
rdf:type fedora:Resource ;
rdf:type ldp:BasicContainer ;
rdf:type http://pcdm.org/models#Object ;
fedora:lastModifiedBy "bypassAdmin" ;
http://schema.org/dateModified "2020-01-29T17:20:24+00:00"^^http://www.w3.org/2001/XMLSchema#dateTime ;
http://localhost:8000/taxonomy/term/44 ;
http://schema.org/author http://localhost:8000/user/1 ;
"

test

\r\n"@en ;
http://schema.org/sameAs http://localhost:8000/node/7 ;
http://schema.org/dateCreated "2020-01-28T19:10:31+00:00"^^http://www.w3.org/2001/XMLSchema#dateTime ;
http://localhost:8000/taxonomy/term/32 ;
dcterms:extent "1 item" ;
dcterms:identifier "AS11-44-6665A" ;
dcterms:identifier "Another ID" ;
fedora:createdBy "bypassAdmin" ;
http://localhost:8000/taxonomy/term/43 ;
fedora:lastModified "2020-01-29T17:20:25.316Z"^^http://www.w3.org/2001/XMLSchema#dateTime ;
fedora:created "2020-01-28T19:10:54.475Z"^^http://www.w3.org/2001/XMLSchema#dateTime ;
http://localhost:8000/taxonomy/term/41 ;
dcterms:subject http://localhost:8000/taxonomy/term/37 ;
http://id.loc.gov/vocabulary/relators/abr http://localhost:8000/taxonomy/term/45?_format=jsonld ;
dcterms:title "Apollo 11 Hasselblad image from film magazine 44/V - LM inspection, rendezvous"@en ;
http://localhost:8000/taxonomy/term/42 ;
rdf:type ldp:RDFSource ;
rdf:type ldp:Container .
```

Notice the < and > around some of the dcterms predicates - they should not be there. Fedora thinks that <dcterms:temporal> is a full URL versus a prefix.

When I add dcterms to the islandora.module namespace declaration section, things are fixed.

I know dc is defined by drupal to be the dcterms namespace. So one of two things needs to happen -- all the dcterms references in the rdf mapping files need to change to dc - or - the dcterms prefix should be added to the islandora.module. I'd prefer the later solution, because dc pointing to dcterms may seem a bit confusing to users who regularly use both http://purl.org/dc/terms/ and http://purl.org/dc/elements/1.1/.

Source

bseeger

All 8 comments

Admittedly, I should have caught those particular "dcterms" mappings when reviewing the PR that added them before merging it. That stated, I think the idea of explicitly adding the "dcterms" namespace (along with updating our existing mappings to use "dcterms" instead of "dc") is appropriate.

seth-shaw-unlv on 29 Jan 2020

Tagging MIG folks: @mbolam,@rtilla1, and @rosiel... Would there be any objections to us explicitly adding the 'dcterms' namespace and using them in our RDF Mappings? (Drupal core uses 'dc' to represent Dublin Core Terms and we've simply followed along.) We would keep 'dc11' for Elements.

seth-shaw-unlv on 29 Jan 2020

I think the path of least resistance is to duplicate the existing URL with the new or more correct "dcterms". So I am 👍 on this

whikloj on 30 Jan 2020

I'll add another PR for the islandora_defaults changing the dc prefixes to dcterms for consistency.

bseeger on 31 Jan 2020

👍1

PR changing dc to dcterms in config files: https://github.com/Islandora/islandora_defaults/pull/22

bseeger on 31 Jan 2020

👍1

Great catch @bseeger, this sounds awesome. So to be clear, we will in practice use dc11 as the prefix for dc elements, and dcterms for, well, dcterms. Disambiguation ftw.