. "Operational Point at start of Section of Line"@en . . . "Unique OP ID at start of section of line (kilometres increasing from start OP to the end OP).\nIn https://eur-lex.europa.eu/eli/reg_impl/2019/773/oj 3.1.1 Line segment extremity 1."@en . "1.1.0.0.0.3" . . . "SOLOPStart" . "stable" . "2021-09-09"^^ . "2023-03-14"^^ . "3.1.1" .