PANS-AIM requires 2 properties in related to the navigation specification of a route segment.

• "Navigation specification" property described as follows

Designation of the navigation specification(s) applicable to a specified segment(s) -  There are two kinds of navigation specifications:

Required navigation performance (RNP) specification. A navigation specification based on area navigation that includes the requirement for performance monitoring and alerting, designated by the prefix RNP, e.g. RNP 4, RNP APCH.

Area navigation (RNAV) specification. A navigation specification based on area navigation that does not include the requirement for performance monitoring and alerting, designated by the prefix RNAV, e.g. RNAV 5, RNAV 1.

• and a  property  for "PBN requirements"
  Area navigation based on performance requirements for aircraft operating along an ATS route, on an instrument approach procedure or in a designated airspace requirements
  
  
  • Navigation performance requirements and
  • Sensor requirements