struct PK_TOPOL_range_vector_o_s
    {
    int                 o_t_version;    --- version number of option structure
    PK_LOGICAL_t        have_tolerance; --- (PK_LOGICAL_false)
    double              tolerance;      --- tolerance
    PK_range_bound_t    bound;          --- bounds on min separation
    PK_range_guess_t    guess;          --- guess for end on topol
    };

typedef struct PK_TOPOL_range_vector_o_s PK_TOPOL_range_vector_o_t;



Holds optional controls for finding the global minimum separation between a
topological entity and a position.


The option structure defines options applicable to finding the global minimum
separation between a topological entity and a position.