Annex B: Data types B.1 Core B.1.1 e_unit Table 202. e_unit Type Relations union e_unitDistance e_unitSpeed e_unitMass e_unitSlope B.1.2 t_grEqZero Table 203. t_grEqZero Type Restriction double [0,∞[ B.1.3 t_grEqZeroOrContactPoint Table 204. t_grEqZeroOrContactPoint Type Restriction double start ; end ; [0,∞[ B.1.4 t_grZero Table 205. t_grZero Type Restriction double ]0,∞[ B.1.5 t_zeroOne Table 206. t_zeroOne Type Restriction double [0;1] B.2 Road B.2.1 e_countryCode Table 207. e_countryCode Type Restriction string [A-Z]{2} B.2.2 t_maxSpeed Table 208. t_maxSpeed Type Restriction e_maxSpeedString no limit ; undefined ; [0,∞[ Annex A: Enumerations Annex C: Terms for dynamic signals (normative)