The hover card of a citation: the norm's head and the first 300 characters.

abs, satz, nr, lit (optional, cite-anchor 03.10.2026): the cited Absatz, Satz, Nummer and Buchstabe (§ 309 Nr. 7 Buchst. a BGB is nr=7&lit=a). With any of them, text opens at the cited Absatz and mark is [start, end] of the cited Satz, Nummer or Buchstabe inside text; found lists the units that were found in the stored text (a unit that is not found is not guessed). Without them the answer is exactly what it has always been, and carries neither field.

asof (optional, YYYY-MM-DD): the version in force on that day, as /v1/norm?asof= picks it; version.valid_from and version.valid_to are its dates and asof echoes the day. No version held for that day is a 404 that says when the archive starts, never today's text in its place. Without asof the answer is unchanged and carries no asof field.