** XML 4.1, 4.2, 4.3, 4.4 and 4.5, only for plant, reissue, and utility types
*** <code>//us-bibliographic-data-grant/classifications-ipcr/classification-ipcr/section</code> + <code>//us-bibliographic-data-grant/classifications-ipcr/classification-ipcr/class</code> + <code>//us-bibliographic-data-grant/classifications-ipcr/classification-ipcr/subclass</code>
***example: A+01+C, respectively. Note: The subclass here is C, but it is within section A and class 01.
** APS
*** ?