Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Security of private property rights — formal recognition, expropriation risk, titling systems.
Estonia amended family-law legislation so that two adults may marry regardless of sex from 2024, while also updating registered-partnership and parentage rules. The reform converted an incomplete partnership framework into equal marriage access and clarified the family-law status, inheritance, and parental rights of same-sex couples.
Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.
Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".
Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.