Ada Programming/Libraries/Ada.Strings.Fixed.Less Case Insensitive

is a unit of the Predefined Language Environment since Ada 2012.

Specification
AdaStringsFixedLess_Case_Insensitive Left Right String  Boolean AdaStringsLess_Case_Insensitive

Wikibook

 * Ada Programming/Libraries/Ada
 * Ada Programming/Libraries/Ada.Strings
 * Ada Programming/Libraries/Ada.Strings.Fixed