PK_TOPOL_fctab_edge_fin_t

struct PK_TOPOL_fcstr_edge_fin_s
       {
       PK_EDGE_t  edge;
       int        fin;
       };
typedef struct PK_TOPOL_fcstr_edge_fin_s
               PK_TOPOL_fcstr_edge_fin_t;
struct PK_TOPOL_fctab_edge_fin_s
       {
       PK_TOPOL_fcstr_edge_fin_t   *data;
       int                        length;
       };
typedef struct PK_TOPOL_fctab_edge_fin_s
               PK_TOPOL_fctab_edge_fin_t;

Used in:

PK_TOPOL_facet_r_t

This is a support structure for PK_TOPOL_facet_r_t.  It is a lookup table
which maps fin indices into edge entity values. (i.e. it defines which fin is
derived from which PK edge entity).

NOTE: The mapping from fin to edge is a sparse relation, where interior fins
      have no association with PK edges. The two column table provides a
      compact notation for such data.