Resolve a single Austrian legal citation to its canonical RIS document deterministically — no keyword search. Four routes are auto-detected from the citation shape (or forced with kind): a norm citation — section-first ("§ 6 DSG", "Art 10 B-VG"), abbreviation-first ("DSG §1", "DSGVO Art32", the shape ris_search_case_law returns in norms_cited), or a bare abbreviation like "ABGB" — resolves through consolidated federal law, or a Bundesland with a state hint, as in force today or on in_force_as_of; a gazette citation ("BGBl. I Nr. 165/1999", pre-2004 "BGBl. Nr. 194/1961", imperial "RGBl. Nr. 189/1902", or "LGBl. Nr. 61/2026" with a state hint) routes to the right federal era tier by year, or to a state Landesgesetzblatt — falling back to that Bundesland’s pre-e-Recht series when the citation predates its switch; a case number ("Ro 2026/03/0016", "G 287/2022", "14Os49/26a", "2025-0.934.677", "W256 …") is matched to its court — pass court to skip detection, and ambiguous formats probe up to two courts; a collection number ("VfSlg 19.632/2012", "VwSlg 18.000 A/2010") resolves through the VfGH/VwGH collection — a VwSlg cite given without its part letter can name one decision in each of the two VwGH series, and comes back as ambiguous with both cites named rather than resolved to one of them. Returns the single best-matching document in the same shape as the corresponding search tool, with alternatives_count when more than one matched. A citation that cannot be classified or resolved returns found: false with next-step guidance — it never throws for a miss; only an upstream RIS outage is an error. For keyword rather than citation lookup, use ris_search_legislation or ris_search_case_law.