How is characterization equipment modeled in the ontology/KG?

[mdeagen]

e.g., one of the classes in the NanoMine namespace is <http://nanomine.org/ns/keithley-6517a-electrometer>

Running the following SPARQL query:

PREFIX sio: <http://semanticscience.org/resource/>

SELECT * WHERE {
  ?sub a <http://nanomine.org/ns/keithley-6517a-electrometer> ;
       sio:hasAttribute [ ?pred  ?obj ]
}

returns these results:

Should there be a sio:hasValue here? What kind of class is file:///apps/whyis/method_attr.uri?