2. Syntax#

interspectrum = PROJ_SPEC_BASE (
    ◆ SPEC_TURB = spectrum,
    ◇ TOUT_CMP =/"OUI" (by default),
                 /"NON ",
    ◆/BASE_ELAS_FLUI = melasflu,
      /MODE_MECA = meca fashion,
      /CHAM_NO = fiel_no,
    # If: exists (" BASE_ELAS_FLUI ")
        ◆ VITE_FLUI = float,
        ◇ PRECISION = float (default: 0.001),
    ◆ FREQ_INIT = float,
    ◆ FREQ_FIN = float,
    ◆ NB_POIN = int,
    ◇ OPTION =/"TOUT" (by default),
               /"DIAG ",
    ◆/TOUT = "OUI" (or not specified),
      /GROUP_MA = grma,
    ◇ & MODELE_INTERFACE = model,
    ◇ VECT_X = float,
    ◇ VECT_Y = float,
    ◇ ORIG_AXE = float,
    ◇ TITRE = text,
)

◆: mandatory
◇: optional
: present by default
&: together
/: only one among
|: several possible choices