rdf_sync-1.x-dev/config/install/rdf_sync.settings.yml

graph_uri: http://data
connector:
  id: virtuoso
  config:
    endpoint: basic
    scheme: http
    host: localhost
    port: 8890
    paths:
      query: sparql
      update: sparql
      graph_store: sparql-graph-crud
    credentials:
      user: null
      password: null