#A.19.SOURCE-SET-SPACE-SUBSTRATE:5.1 - System

Preface node heading:a-19-source-set-space-substrate-5-1-system:24667

#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

Tell. One QD line keeps saying that one archive is both the search-side role and the evaluation basis. Downstream readers need to see that the same declared CharacteristicSpace can still occupy two different role positions without turning the archive or the descriptor layer into the space itself.

Show.

SourceSetFamily       = Archive
SearchSpaceRef          = BehaviorCharacteristicSpace@ed=12
OutcomeSpaceRef         = BehaviorCharacteristicSpace@ed=12
SpaceRefRelationKind    = sameDeclaredSpaceAs
SourceToOutcomeRelation = archive-retained candidates are navigated and judged
                          for local coverage gain in the same declared behavior
                          space
DistortionPosture       = metric/model-dependent; descriptor realization and
                          neighborhood metric qualifier are active
DescriptorMapRef        = QDDescriptorMap@ed=9
DistanceDefRef          = ArchiveNeighborhoodDistance@ed=4
SpaceMetricRef          = ArchiveNeighborhoodMetric@ed=4

Cash-out. This line now says three distinct things cleanly: the active source set is one archive, both role-refs resolve to the same declared CharacteristicSpace, and the DescriptorMapRef plus DistanceDefRef are only interpretive layers over that shared space reference. A downstream selection or archive-maintenance discussion can reuse this line without pretending the archive itself is the space.

Last Updated: 2026-06-17 — upstream FPF commit 646b0b9b (github.com/ailev/FPF)