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Library / First Principles Framework (FPF) - Core Conceptual Specification
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A.19.SOURCE-SET-SPACE-SUBSTRATE:0.2 - What this buys

This pattern buys one conservative but expressive substrate declaration:

  • the active source set stays visible;
  • the search-side and outcome-side references over A.19 spaces stay distinct;
  • the relation between those refs becomes inspectable instead of being hidden in one overloaded noun or verb;
  • heavier qualifier refs remain available without being forced into every case;
  • and interpretive-view or publication neighbors can reuse the substrate without changing what it means.

The practical payoff is simple: readers can tell what the line is acting on, what relation between the two space refs it assumes, what kind of qualification they must keep in view, and which neighboring pattern governs the next use or action if that requirement grows.