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Description of general behavior....
Note that there was some initial confusion
which is reflected in this diagram.
I should emphasize that the gateway may
actively solicit the NSDL servers for whether
there be content changes (assumingly to trust
the metadata as opposed to download and checksum
content) and pass this information onto the
LON-CAPA servers.  The Gateway Server is NOT a central
repository for downloaded content from NSDL.
It merely negotiates the transaction by which
NSDL content is transferred to and delivered
by a LON-CAPA server in an educational context.

    1: #FIG 3.2
    2: Landscape
    3: Center
    4: Inches
    5: Letter  
    6: 100.00
    7: Single
    8: -2
    9: 1200 2
   10: 6 375 6075 10125 8625
   11: 6 750 6525 3300 6975
   12: 4 0 0 50 0 17 12 0.0000 4 180 2520 750 6675 receive OAI harvesting request\001
   13: 4 0 0 50 0 17 12 0.0000 4 180 1680 750 6900 for metadata pattern\001
   14: -6
   15: 6 3525 7425 7125 8625
   16: 6 3750 7575 6975 8400
   17: 4 0 0 50 0 18 12 0.0000 4 135 2985 3750 7725 Poll the other LON-CAPA servers\001
   18: 4 0 0 50 0 18 12 0.0000 4 180 3075 3750 7950 for responses to the availability of\001
   19: 4 0 0 50 0 18 12 0.0000 4 135 3165 3750 8175 a /res/DOMAIN/... data or metadata\001
   20: 4 0 0 50 0 18 12 0.0000 4 105 780 3750 8400 resource\001
   21: -6
   22: 2 4 0 1 0 0 50 0 -1 0.000 0 0 12 0 0 5
   23: 	 7125 8625 3525 8625 3525 7425 7125 7425 7125 8625
   24: -6
   25: 6 675 7800 3300 8175
   26: 4 0 0 50 0 17 12 0.0000 4 180 2520 675 7950 receive OAI harvesting request\001
   27: 4 0 0 50 0 17 12 0.0000 4 135 2580 675 8175 for metadata record or resource\001
   28: -6
   29: 6 6150 6525 8625 6975
   30: 4 0 0 50 0 17 12 0.0000 4 180 2475 6150 6675 respond with OAI query result\001
   31: 4 0 0 50 0 17 12 0.0000 4 180 1215 6150 6900 (i.e. record list)\001
   32: -6
   33: 6 6000 6900 7875 7050
   34: 6 7725 6900 7875 7050
   35: 1 2 0 1 0 0 50 0 -1 0.000 1 0.0000 7800 6975 75 75 7725 6900 7875 7050
   36: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 7797 6974 37 37 7760 6937 7835 7012
   37: -6
   38: 2 1 0 1 0 0 50 0 20 0.000 0 0 -1 1 0 2
   39: 	1 1 1.00 90.00 135.00
   40: 	 6000 6975 7725 6975
   41: -6
   42: 6 7350 7800 10125 8250
   43: 4 0 0 50 0 17 12 0.0000 4 180 2475 7350 7950 respond with OAI query result\001
   44: 4 0 0 50 0 17 12 0.0000 4 180 2715 7350 8175 (i.e. metadata record or resource)\001
   45: -6
   46: 6 7125 8250 9000 8400
   47: 6 8850 8250 9000 8400
   48: 1 2 0 1 0 0 50 0 -1 0.000 1 0.0000 8925 8325 75 75 8850 8250 9000 8400
   49: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 8922 8324 37 37 8885 8287 8960 8362
   50: -6
   51: 2 1 0 1 0 0 50 0 20 0.000 0 0 -1 1 0 2
   52: 	1 1 1.00 90.00 135.00
   53: 	 7125 8325 8850 8325
   54: -6
   55: 6 3600 6675 6000 7125
   56: 4 0 0 50 0 18 12 0.0000 4 135 1500 3600 6825 Search the other\001
   57: 4 0 0 50 0 18 12 0.0000 4 180 2370 3600 7050 LON-CAPA library servers\001
   58: -6
   59: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 450 6975 75 75 375 6900 525 7050
   60: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 450 8250 75 75 375 8175 525 8325
   61: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 2
   62: 	1 1 1.00 90.00 135.00
   63: 	 450 6975 3525 6975
   64: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 2
   65: 	1 1 1.00 90.00 135.00
   66: 	 450 8250 3525 8250
   67: 2 4 0 1 0 7 50 0 -1 0.000 0 0 12 0 0 5
   68: 	 6005 7200 3525 7200 3525 6600 6005 6600 6005 7200
   69: 4 0 0 50 0 18 12 0.0000 4 180 4320 375 6225 GATEWAY FEATURE: Provide for OAI harvesting\001
   70: -6
   71: 6 375 4650 7500 5700
   72: 6 675 5025 2850 5400
   73: 4 0 0 50 0 17 12 0.0000 4 180 1965 675 5175 receive resource request\001
   74: 4 0 0 50 0 17 12 0.0000 4 135 2130 675 5400 from LON-CAPA network\001
   75: -6
   76: 6 3375 5175 5400 5550
   77: 4 0 0 50 0 18 12 0.0000 4 135 1965 3375 5325 Access internal mirror\001
   78: 4 0 0 50 0 18 12 0.0000 4 135 1575 3375 5550 of NSDL archives\001
   79: -6
   80: 6 5625 5400 7500 5550
   81: 6 7350 5400 7500 5550
   82: 1 2 0 1 0 0 50 0 -1 0.000 1 0.0000 7425 5475 75 75 7350 5400 7500 5550
   83: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 7422 5474 37 37 7385 5437 7460 5512
   84: -6
   85: 2 1 0 1 0 0 50 0 20 0.000 0 0 -1 1 0 2
   86: 	1 1 1.00 90.00 135.00
   87: 	 5625 5475 7350 5475
   88: -6
   89: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 450 5475 75 75 375 5400 525 5550
   90: 2 1 0 1 0 0 50 0 20 0.000 0 0 -1 1 0 2
   91: 	1 1 1.00 90.00 135.00
   92: 	 450 5475 3225 5475
   93: 2 4 0 1 0 7 50 0 -1 0.000 0 0 12 0 0 5
   94: 	 5625 5700 3225 5700 3225 5100 5625 5100 5625 5700
   95: 4 0 0 50 0 18 12 0.0000 4 135 5565 375 4800 GATEWAY FEATURE: Allow for use within educational network\001
   96: 4 0 0 50 0 17 12 0.0000 4 180 1245 5775 5400 answer request\001
   97: -6
   98: 6 375 750 8625 4125
   99: 6 450 1050 2625 1725
  100: 4 0 0 50 0 17 12 0.0000 4 180 2085 450 1200 to be potentially replaced\001
  101: 4 0 0 50 0 17 12 0.0000 4 180 1875 450 1425 in the future by Cornell\001
  102: 4 0 0 50 0 17 12 0.0000 4 180 2145 450 1650 central repository strategy\001
  103: -6
  104: 6 3000 1050 8625 3450
  105: 6 4800 1125 7050 1500
  106: 4 0 0 50 0 18 12 0.0000 4 135 2175 4800 1500 mirror of NSDL archives\001
  107: 4 0 0 50 0 18 12 0.0000 4 180 2190 4800 1275 Update gateway internal\001
  108: -6
  109: 6 3150 1800 8475 3300
  110: 6 5700 1875 7650 2175
  111: 2 4 0 1 0 0 50 0 -1 0.000 0 0 7 0 0 5
  112: 	 7650 2175 7650 1875 5700 1875 5700 2175 7650 2175
  113: 4 0 0 50 0 18 12 0.0000 4 135 1815 5775 2100 OAI server available\001
  114: -6
  115: 6 3300 2250 5625 2550
  116: 2 4 0 1 0 0 50 0 -1 0.000 0 0 7 0 0 5
  117: 	 5625 2550 5625 2250 3300 2250 3300 2550 5625 2550
  118: 4 0 0 50 0 18 12 0.0000 4 135 2220 3375 2475 Mirror has list of records\001
  119: -6
  120: 6 5700 2625 8475 2925
  121: 2 4 0 1 0 0 50 0 -1 0.000 0 0 7 0 0 5
  122: 	 8475 2925 8475 2625 5700 2625 5700 2925 8475 2925
  123: 4 0 0 50 0 18 12 0.0000 4 135 2610 5775 2850 Mirror has a metadata record\001
  124: -6
  125: 6 3675 3000 5700 3300
  126: 2 4 0 1 0 0 50 0 -1 0.000 0 0 7 0 0 5
  127: 	 5700 3300 5700 3000 3675 3000 3675 3300 5700 3300
  128: 4 0 0 50 0 18 12 0.0000 4 135 1920 3750 3225 Mirror has a resource\001
  129: -6
  130: 6 3150 3075 3300 3225
  131: 1 2 0 1 0 0 50 0 -1 0.000 1 0.0000 3225 3150 75 75 3150 3075 3300 3225
  132: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 3222 3149 37 37 3185 3112 3260 3187
  133: -6
  134: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 3750 2025 75 75 3675 1950 3825 2100
  135: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 2
  136: 	1 1 1.00 90.00 135.00
  137: 	 3750 2025 5700 2025
  138: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 4
  139: 	1 1 1.00 90.00 135.00
  140: 	 7650 2025 8475 2025 8475 2475 5625 2475
  141: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 4
  142: 	1 1 1.00 90.00 135.00
  143: 	 3300 2475 3225 2475 3225 2850 5700 2850
  144: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 3
  145: 	1 1 1.00 90.00 135.00
  146: 	 7200 2925 7200 3225 5700 3225
  147: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 2
  148: 	1 1 1.00 90.00 135.00
  149: 	 3675 3150 3300 3150
  150: 4 0 0 50 0 17 12 0.0000 4 180 2595 5775 2400 request list of metadata records\001
  151: 4 0 0 50 0 17 12 0.0000 4 180 1170 4425 2775 request record\001
  152: 4 0 0 50 0 17 12 0.0000 4 180 1350 5775 3150 request resource\001
  153: 4 0 0 50 0 17 12 0.0000 4 135 1545 3975 1950 contact OAI server\001
  154: -6
  155: 2 4 0 1 0 0 50 0 -1 0.000 0 0 7 0 0 5
  156: 	 8625 3450 8625 1050 3000 1050 3000 3450 8625 3450
  157: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 0 0 2
  158: 	 3000 1650 8625 1650
  159: 4 0 0 50 0 17 12 0.0000 4 135 1050 7350 1275 with relevant\001
  160: 4 0 0 50 0 17 12 0.0000 4 180 615 7500 1500 looping\001
  161: -6
  162: 6 4425 3600 7425 4050
  163: 4 0 0 50 0 17 12 0.0000 4 180 2955 4425 3750 notify all subscribing access servers\001
  164: 4 0 0 50 0 17 12 0.0000 4 180 870 4425 3975 of updates\001
  165: -6
  166: 6 7500 3975 7650 4125
  167: 1 2 0 1 0 0 50 0 -1 0.000 1 0.0000 7575 4050 75 75 7500 3975 7650 4125
  168: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 7572 4049 37 37 7535 4012 7610 4087
  169: -6
  170: 1 2 0 1 0 0 50 0 20 0.000 1 0.0000 450 2175 75 75 375 2100 525 2250
  171: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 2
  172: 	1 1 1.00 90.00 135.00
  173: 	 450 2175 3000 2175
  174: 2 1 0 1 0 0 50 0 -1 0.000 0 0 -1 1 0 3
  175: 	1 1 1.00 90.00 135.00
  176: 	 4350 3450 4350 4050 7500 4050
  177: 4 0 0 50 0 18 12 0.0000 4 135 4245 450 900 GATEWAY FEATURE: Web crawl NSDL archives\001
  178: 4 0 0 50 0 17 12 0.0000 4 180 2010 675 2025 periodic (daily) updating\001
  179: -6