Files containing "skos:Concept" or "Concept" type "rdf:Description" are processed by this service.
The hierarchical relationship between a concept A and a concept B is expressed using the "skos:broader" property. The presence of a "skos:narrower" property (which is the inverse relationship) at the level of concept B is not mandatory because it is inferred from the "skos:broader" property.
However, the proper functioning of some applications (like Skosmos) requires the presence of both relationships. This service allows to insert at the level of the broader concept as many "skos:narrower" properties as narrower concepts of this concept.