relation_extend

Overview
Transforms generic dcterms:relation in JSON-LD into specific RDF predicates based on your relationship nodes and role terms.

Requirements

• Role taxonomy: add a Text field field_rdf_property to hold each term’s predicate IRI (e.g. schema:translationOfWork).
• Relationship content types: include a field_role (to Role terms) and one or more field_to_* reference fields.
• JSON-LD enabled for Node in REST (?_format=jsonld or Accept: application/ld+json).

Setup

1. Add field_rdf_property to Structure → Taxonomy → Role → Manage fields.
2. Copy the module to modules/custom/relation_extend/ and ensure relation_extend.info.yml depends on serialization and jsonld.
3. Enable modules:

   drush en serialization jsonld relation_extend -y
   drush cr