code: @Nonnull
    public static SchematronResourcePure fromString (@Nonnull final String sSchematron, @Nonnull final Charset aCharset)
    {
      return fromByteArray (sSchematron.getBytes (aCharset));
    }
docs: Create a new {@link SchematronResourcePure} from Schematron rules provided
  by an arbitrary String.<br>
  <b>Important:</b> in this case, no include resolution will be performed!!
  
  @param sSchematron
  The String representing the Schematron. May not be <code>null</code>
  .
  @param aCharset
  The charset to be used to convert the String to a byte array.
  @return Never <code>null</code>.