//! Standard IRIs used in structural defaults and classification.
/// The universal OWL class.
pub const OWL_THING: &str = "http://www.w3.org/2002/07/owl#Thing";
/// The empty OWL class.
pub const OWL_NOTHING: &str = "http://www.w3.org/2002/07/owl#Nothing";
/// The universal RDF literal datatype.
pub const RDFS_LITERAL: &str = "http://www.w3.org/2000/01/rdf-schema#Literal";