FPF Reference

    A.19.SOURCE-SET-SPACE-SUBSTRATE:10 - Rationale

    Preface node heading:a-19-source-set-space-substrate-10-rationale:24202

    What this page is

    This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

    Methodology

    Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

    Content

    The pattern chooses a narrow but sturdy center of gravity.

    A.19 already declares CharacteristicSpace. The missing load is not another free-floating space kind. It is the ref-position and relation stack that tells the reader:

    • which declared source set is active;
    • which declared space is named in the search-side position;
    • which declared space is named in the outcome-side position;
    • what SpaceRefRelationKind says about those two refs;
    • and how much transparency, distortion, uncertainty, or error the line is honestly claiming.

    That is why this pattern stops before interpretive views and before publication metadata. If it tried to say less, the load would collapse back into vague space or projection talk. If it tried to say more, it would start absorbing views, fronts, archives, shortlists, or shipping semantics that belong elsewhere.

    Last Updated: 2026-06-08 — upstream FPF commit 093d30e8 (github.com/ailev/FPF)