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(s : rectangular_composite_surface) : BOOLEAN;
REPEAT i := 1 TO s.n_u;
REPEAT j := 1 TO s.n_v;
IF NOT (('STRUCTURAL_FRAME_SCHEMA.B_SPLINE_SURFACE' IN TYPEOF
(s.segments[i][j].parent_surface)) OR
('STRUCTURAL_FRAME_SCHEMA.RECTANGULAR_TRIMMED_SURFACE' IN TYPEOF
(s.segments[i][j].parent_surface))) THEN
RETURN(FALSE);
END_IF;
END_REPEAT;
END_REPEAT;
REPEAT i := 1 TO s.n_u-1;
REPEAT j := 1 TO s.n_v;
IF s.segments[i][j].u_transition = discontinuous THEN
RETURN(FALSE);
END_IF;
END_REPEAT;
END_REPEAT;
REPEAT i := 1 TO s.n_u;
REPEAT j := 1 TO s.n_v-1;
IF s.segments[i][j].v_transition = discontinuous THEN
RETURN(FALSE);
END_IF;
END_REPEAT;
END_REPEAT;
RETURN(TRUE);
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