classes.json

{
    "__background__":   0,

    "text":         1,
    "junction":     2,
    "crossover":    3,
    "terminal":     4,
    "gnd":          5,
    "vss":          6,

    "voltage.dc":       7,
    "voltage.ac":       8,
    "voltage.battery":  9,

    "resistor":             10,
    "resistor.adjustable":  11,
    "resistor.photo":       12,

    "capacitor.unpolarized":    13,
    "capacitor.polarized":      14,

    "inductor":     15,
    "transformer":  16,

    "diode":                17,
    "diode.light_emitting": 18,
    "diode.thyrector":      19,
    "diode.zener":          20,

    "diac":                 21,
    "triac":                22,
    "thyristor":            23,
    "varistor":             24,

    "transistor.bjt":   25,
    "transistor.fet":   26,
    "transistor.photo": 27,

    "operational_amplifier":                    28,
    "operational_amplifier.schmitt_trigger":    29,
    "optocoupler":                              30,

    "integrated_circuit":                   31,
    "integrated_circuit.ne555":             32,
    "integrated_circuit.voltage_regulator": 33,
   
    "xor":  34,
    "and":  35,
    "or":   36,
    "not":  37,
    "nand": 38,
    "nor":  39,

    "probe.current": 40,
    "probe.voltage": 41,

    "switch":   42,
    "relay":    43,

    "socket":   44,
    "fuse":     45,

    "speaker":      46,
    "motor":        47,
    "lamp":         48,
    "microphone":   49,
    "antenna":      50,
    "crystal":      51,

    "unknown":  52
}