How to understand the restrictions of Section 58 (S58) designations in Confirm

Product Feature: Gazetteers

S58 designations are restrictions in the Confirm application.

Restrictions can not be exported through the NSG (National Street Gazetteer). There are the special designations that can only be exported through NSG, S58 does not fall under them. 

You can extract the list of designations which can be exported through NSG by referring to the 'Special Designation Codes' section on pages no. 61 and 62 in the NSG specification document. 
UPDATED:  September 20, 2017