What is composite position tolerance and how does it differ from single-segment position?

Composite position tolerance uses two horizontal segments in a feature control frame. The upper segment (PLTZF - Pattern Locating Tolerance Zone Framework) controls the pattern location relative to datums. The lower segment (FRTZF - Feature Relating Tolerance Zone Framework) controls the relationship between features within the pattern with a tighter tolerance but without locating the pattern. This allows looser pattern location while maintaining tight feature-to-feature relationships.