* '''IPCR_SUBCLASS'''
** XML 4.35 plant, 4.4reissue, 4.5and 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: C
* '''IPCR_MAIN_GROUP'''
** XML 4.35 plant, 4.4reissue, 4.5and utility types
*** <code>//us-bibliographic-data-grant/classifications-ipcr/classification-ipcr/main-group</code>
***example: 11
* '''IPCR_SUB_GROUP'''
** XML 4.35 plant, 4.4reissue, 4.5and utility type
*** <code>//us-bibliographic-data-grant/classifications-ipcr/classification-ipcr/subgroup</code>
***example: 00