code: @Nonnull
    public static SchematronResourcePure fromSchema (@Nonnull final PSSchema aSchematron)
    {
      return fromString (new PSWriter ().getXMLString (aSchematron), XMLWriterSettings.DEFAULT_XML_CHARSET_OBJ);
    }
docs: Create a new {@link SchematronResourcePure} from Schematron rules provided
  by a domain model.<br>
  <b>Important:</b> in this case, no include resolution will be performed!!
  
  @param aSchematron
  The Schematron model to be used. May not be <code>null</code> .
  @return Never <code>null</code>.