Add AlternativeContentDescription

[dennis-ruhe-npo]

• Adds AlternativeContentDescription class
• Adds hasAlternativeContentDescription object property
• Adds hasAlternativeContentDescription properties to EditorialObject and PublicationEvent

Reference https://ontology.metadatahub.bijnpo.nl/ontology#

[dennis-ruhe-npo]

@JuergenGrupp

As discussed in our meeting yesterday, we do not require the inclusion of ec:hasStartDateTime or ec:hasEndDateTime, nor do we require ec:hasIdentifier. We also don't use it on an ec:PublicationEvent I simply used the ec:AlternativeTitle as a reference in this pull request.

I would be happy to change this PR to remove the things we don't need.

As requested, an example usage:

@prefix ec: <http://www.ebu.ch/metadata/ontologies/ebucoreplus#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix npo_o: <http://ontology.metadatahub.bijnpo.nl/ontology#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .

<http://metadatahub.bijnpo.nl/08d79e34-78d6-4014-b7bb-e4332acd97d8> 
    a ec:Programme ;
    npo_o:hasAlternativeContentDescription <http://metadatahub.bijnpo.nl/08221f0d-d590-42ab-971e-e6ae07d70303> .

<http://metadatahub.bijnpo.nl/08221f0d-d590-42ab-971e-e6ae07d70303> 
    a npo_o:AlternativeContentDescription ;
    ec:hasObjectType <http://metadatahub.bijnpo.nl/alternative-content-description-type/1>
    ec:contentDescription "De wereldberoemde magicians Rob en Emiel reizen het land af om de jeugd te verbazen en te verrassen met hun magische acts vol humor." .

# Description types
<http://metadatahub.bijnpo.nl/alternative-content-description-type/1>
    a owl:NamedIndividual, skos:Concept ;
    skos:inScheme <urn:npo:metadata-cs:AlternativeContentDescriptionTypeCS> ;
    skos:notation "1" ;
    skos:prefLabel "Kicker description" ;
    skos:definition "The kicker (one-liner) description of the work." .

<http://metadatahub.bijnpo.nl/alternative-content-description-type/2>
    a owl:NamedIndividual, skos:Concept ;
    skos:inScheme <urn:npo:metadata-cs:AlternativeContentDescriptionTypeCS> ;
    skos:notation "2" ;
    skos:prefLabel "Short description" ;
    skos:definition "The short description of the work." .

# And there are ideas to include a "Medium description" and "Styled description", but these are not formalised.