Getting Topic Labels

To Retrieve all Labels for a Topic

The special predicate http://www.networkedplanet.com/tmsparql/label can be used to retrieve all labels of a topic. For example the following query finds all person topics and returns the topic address and all of its labels.

PREFIX ont: <http://psi.networkedplanet.com/types/>
PREFIX tms: <http://www.networkedplanet.com/tmsparql/
SELECT ?t ?l WHERE {
  ?t a ont:person .
  ?t tms:label ?l
}

In the query above, if a topics has two labels then results set will have two rows for that topics - in each row the topic address in the ?t column will be the same, but the ?l column will contain each label value on a separate row.

To Retrieve a Specific Label for a Topic

To return the label for a topic in a particular language, you can add the language code to the end of the predicate URL - for example the predicate http://www.networkedplanet.com/tmsparql/label/en-us returns only the US English label for the topic. You should be careful when using this more specific type of query because topics that do not have a label in the specified language will not be returned unless you put the label triple pattern in an OPTIONAL block. The following query finds only those products that have a French label:

PREFIX ont: <http://psi.networkedplanet.com/types/>
SELECT ?t ?l WHERE {
  ?t a ont:product .
  ?t <http://www.networkedplanet.com/tmsparql/label/fr> ?l
}

The following query finds the French and English labels for products and will return products that have a French label, an English label or neither

PREFIX ont: <http://psi.networkedplanet.com/types/>
SELECT ?t ?fr ?en WHERE {
  ?t a ont:product .
  OPTIONAL { ?t <http://www.networkedplanet.com/tmsparql/label/fr> ?fr } .
  OPTIONAL { ?t <http://www.networkedplanet.com/tmsparql/label/en> ?en }
}