struct PK_TOPOL_fcstr_param_uv_s
       {
       double u;
       double v;
       };
typedef struct PK_TOPOL_fcstr_param_uv_s
               PK_TOPOL_fcstr_param_uv_t;
struct PK_TOPOL_fctab_param_uv_s
       {
       PK_TOPOL_fcstr_param_uv_t *data;
       int                       length;
       };
typedef struct PK_TOPOL_fctab_param_uv_s  PK_TOPOL_fctab_param_uv_t;


This is a support structure for PK_TOPOL_facet_r_t. It represents
a two column table of u,v surface parameterisation values