These constants give the type of logical switch function.
LS_FUNC_NONE
LS_FUNC_VEQUAL
LS_FUNC_VALMOSTEQUAL
LS_FUNC_VPOS
LS_FUNC_VNEG
LS_FUNC_RANGE
LS_FUNC_APOS
LS_FUNC_ANEG
LS_FUNC_AND
LS_FUNC_OR
LS_FUNC_XOR
LS_FUNC_EDGE
LS_FUNC_EQUAL
LS_FUNC_GREATER
LS_FUNC_LESS
LS_FUNC_DIFFEGREATER
LS_FUNC_ADIFFEGREATER
LS_FUNC_TIMER
LS_FUNC_STICKY