code: @Check
  	public void checkArtifactUse(SarlArtifact artifact) {
  		error(MessageFormat.format(
  				Messages.SARLValidator_0,
  				this.grammarAccess.getSpaceKeyword()),
  				artifact,
  				null);
  	}
docs: Artifact keyword is reserved.
  
  @param artifact the artifact to check.