AND_GATE
AND_GATE: "AND_GATE"
BASIC_EVENT
BASIC_EVENT: "BASIC_EVENT"
FALSE_EVENT
FALSE_EVENT: "FALSE_EVENT"
HOUSE_EVENT
HOUSE_EVENT: "HOUSE_EVENT"
INHIBIT_GATE
INHIBIT_GATE: "INHIBIT_GATE"
INIT_EVENT
INIT_EVENT: "INIT_EVENT"
INTERMEDIATE_EVENT: "INTERMEDIATE_EVENT"
OR_GATE
OR_GATE: "OR_GATE"
PASS_EVENT
PASS_EVENT: "PASS_EVENT"
TRANSFER_IN
TRANSFER_IN: "TRANSFER_IN"
TRANSFER_OUT
TRANSFER_OUT: "TRANSFER_OUT"
TRUE_EVENT
TRUE_EVENT: "TRUE_EVENT"
UNDEVELOPED_EVENT
UNDEVELOPED_EVENT: "UNDEVELOPED_EVENT"
Enum for fault tree node types, representing standard FTA symbols