PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX vim4: <http://bipm.org/jcgm/vim4#>
PREFIX comp: <http://ua.be/sdo2l/vocabulary/component#>
PREFIX base: <http://ua.be/sdo2l/vocabulary/base#>


SELECT DISTINCT ?class
WHERE {
  ?subject base:ArtifactType ?o .
  ?subject a ?class .
}
