PK_ERROR_code_t  PK_CURVE_ask_part
(
--- received arguments ---
PK_CURVE_t       curve,              --- a curve

--- returned arguments ---
PK_PART_t *const part                --- owning part (possibly PK_ENTITY_null)
)


This function returns the part which owns the given curve, if there is one,
otherwise PK_ENTITY_null.


The part will be returned if the curve is used directly or indirectly
anywhere in its definition:
    either by being attached directly to a fin or edge,
    or as construction geometry connected to the part,
    or by being referenced in the definition of other geometry in the part.