docs: public synchronized FhirValidator setValidateAgainstStandardSchematron(boolean theValidateAgainstStandardSchematron) {
  		if (theValidateAgainstStandardSchematron && !ourPhPresentOnClasspath) {
  			throw new IllegalArgumentException(myContext.getLocalizer().getMessage(I18N_KEY_NO_PH_ERROR));
  		}
  		if (!theValidateAgainstStandardSchematron && !ourPhPresentOnClasspath) {
  			return this;
  		}
  		Class<? extends IValidatorModule> cls = SchematronProvider.getSchematronValidatorClass();
  		IValidatorModule instance = SchematronProvider.getSchematronValidatorInstance(myContext);
  		addOrRemoveValidator(theValidateAgainstStandardSchematron, cls, instance);
  		return this;
  	}