Handle blank node property values elegantly

[rob-metalinkage]

Showing a blank node id is rather unhelpful.

If the object is an OWL class - then you may have multiple rdfs:subClassOf restrictions as blank nodes that looks rather ugly.

pending an option to control nested object display shapes explicitly a reasonable logic would be to only show a property value of a blank node if the node has a label

to provide some control this can be tuned:
a) use skos:prefLabel over rdfs:label
b) suppress property value display if skos:prefLabel is an empty string ""

deployers can entail suitable labels to control display and users never need to see blank nodes.

[nicholascar]

Can you put a link in to an example of BN display now?

[rob-metalinkage]

http://defs-dev.opengis.net/demeter/object?vocab_uri=https://w3id.org/demeter/agri/agriIntervention&uri=http%3A//foodie-cloud.com/model/foodie%23DoseUnit