Metadata expressed with other vocabularies

Some metadata could not be fully described using SKOS. For these cases, we use some other RDF vocabularies, including a local project-specific vocabulary.

The prefixes we'll use below:

Below we explain per use case.

We use following shorthands:

Note 1: if n is a number, it indicates the level of that concept in a hierarchy (1 = highest level)

Linking onderwijsstructuur to curriculum

Onderwijsstructuur concepts can be linked directly to curriculum collections, by means of the ilearn:hasCurriculum relation:

• c ilearn:hasCurriculum l

• If an onderwijsstructuur concept is not linked directly to any curriculum collection, it can be linked indirectly, via a hierarchically higher onderwijsstructuur concept:

  • c3 skos:broaderTransitive c1
  • c1 ilearn:hasCurriculum l

Onderwijsstructuur concepts can be assigned to a specific typical age range (a litteral range, expressed in years):

• c ilearn:typicalAgeRange "16-17"

Linking images

An additional dataset at http://ilearn.ilabt.imec.be/iconen links terms to icons. They are linked according to following structure:

• x foaf:logo y
• y schema:contentUrl z

Using the GraphQL-LD endpoint, one can look up the logos via following query:

{
  id(_:ID) # The ID of, e.g., the sleutelcompetentie you want the logo from
  prefLabel @single
  logo {
    contentUrl
  }
}

Limiting query results to what's wanted in an application

Available from v2 onwards

There may be cases where it is not desirable to have queries return all data from an immutable part of the entire dataset in use. In these cases, we mark the parts of the entire dataset we do want to be returned with the property ilearn:inUseBy.

An example where collections are marked:

• l ilearn:inUseBy "myapp"
• l skos:member c

A GraphQL-LD query to find out marked collections:

{
  TYPE(_:Collection)
  inUseBy(_:"myapp") @single
  id @single
}

A GraphQL-LD query to find out concepts in marked collections:

{
  TYPE(_:Concept)
  memberOf(inUseBy: "myapp")
  id @single
}

A practical example query:

{
  TYPE(_:Collection)
  id(_:ONDERWIJSSTRUCTUUR) @single
  prefLabel @single
  member {
    id @single
    topConceptOf @single
    prefLabel @single
    narrower @optional {
      id @single
      prefLabel @single
      memberOf(inUseBy: "myway")
      narrower @optional {
        id @single
        prefLabel @single
        memberOf(inUseBy: "myway")
        narrower @optional {
          id @single
          prefLabel @single
          memberOf(inUseBy: "myway")
          narrower @optional {
            id @single
            prefLabel @single
            memberOf(inUseBy: "myway")
            narrower @optional {
              id @single
              prefLabel @single
              memberOf(inUseBy: "myway")
            }
          }
        }
      }
    }
  }
}