#FIG 2.1
80 2
5 1 0 5 0 0 0 0 0.000 0 1 0 356.330 409.616 234 124 364 99 509 139
	0 0 5.000 20.000 40.000
6 59 24 424 54
4 0 0 30 0 0 0 0.00000 4 20 108 59 54 DFD - D

4 0 0 30 0 0 0 0.00000 4 20 16 224 54 F

4 0 0 30 0 1 0 0.00000 4 20 48 249 54 low 

4 0 0 30 0 0 0 0.00000 4 20 20 319 54 D

4 0 0 30 0 1 0 0.00000 4 26 80 344 54 iagram

-6
1 3 0 5 0 0 0 0 0.00000 1 0.000 259 224 32 32 259 224 269 254
2 1 0 5 0 0 0 0 0.000 -1 0 0
	 394 499 239 499 239 574 394 574 9999 9999
2 2 0 5 0 0 0 0 0.000 0 0 0
	 314 334 314 404 239 404 239 334 314 334 9999 9999
4 0 0 30 0 1 0 0.00000 4 18 34 169 54 ata

4 0 0 20 0 1 0 0.00000 4 13 33 74 139 data

4 0 0 20 0 1 0 0.00000 4 13 55 69 219 process

4 0 0 20 0 1 0 0.00000 4 17 101 69 349 external entity

4 0 0 20 0 1 0 0.00000 4 13 71 69 529 data base