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 typedef enum {
    SAF_TOPODIM_0D = 0,  /* a zero dimensional topological dimension (e.g. a point) */
    SAF_TOPODIM_1D = 1,  /* a one dimensional topological dimension (e.g. a curve) */
    SAF_TOPODIM_2D = 2,  /* a two dimensional topological dimension (e.g. a surface) */
    SAF_TOPODIM_3D = 3   /* a three dimensional topological dimension (e.g. a volume) */
 } SAF_TopoDim