{
    "__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,
    "capacitor.adjustable":     15,

    "inductor":         16,
    "inductor.ferrite": 17,
    "inductor.coupled": 18,
    "transformer":      19,

    "diode":                20,
    "diode.light_emitting": 21,
    "diode.thyrector":      22,
    "diode.zener":          23,

    "diac":                 24,
    "triac":                25,
    "thyristor":            26,
    "varistor":             27,

    "transistor.bjt":   28,
    "transistor.fet":   29,
    "transistor.photo": 30,

    "operational_amplifier":                    31,
    "operational_amplifier.schmitt_trigger":    32,
    "optocoupler":                              33,

    "integrated_circuit":                   34,
    "integrated_circuit.ne555":             35,
    "integrated_circuit.voltage_regulator": 36,
   
    "xor":  37,
    "and":  38,
    "or":   39,
    "not":  40,
    "nand": 41,
    "nor":  42,
	
    "probe":         43,
    "probe.current": 44,
    "probe.voltage": 45,

    "switch":   46,
    "relay":    47,

    "socket":   48,
    "fuse":     49,

    "speaker":      50,
    "motor":        51,
    "lamp":         52,
    "microphone":   53,
    "antenna":      54,
    "crystal":      55,
    
    "mechanical":   56,
    "magnetic":     57,
    "optical":      58,
    "block":        59,

    "unknown":  60
}