-static bool read_matrices_without_rowtype (struct matrix_data_pgm *);
-static bool read_matrices_with_rowtype (struct matrix_data_pgm *);
-static int string_to_content_type (char *, int *);
+static bool read_matrices_without_rowtype (struct dataset *ds, struct matrix_data_pgm *);
+static bool read_matrices_with_rowtype (struct dataset *ds, struct matrix_data_pgm *);
+static int string_to_content_type (const char *, int *);