{ "class":"TOC", "array":
  [
    { "class":"Dropdown", "desc" : "Overview", "array":
      [
        {"class":"Doc",  "desc" : "The Challenge",                "dir" : "", "file": "TheChallenge" },
        {"class":"Doc",  "desc" : "The Major Sketch Families",    "dir" : "", "file": "MajorSketchFamilies" },
        {"class":"Doc",  "desc" : "Sketch Origins",               "dir" : "", "file": "SketchOrigins" },
        {"class":"Doc",  "desc" : "Sketch Elements",              "dir" : "", "file": "SketchElements" },
        {"class":"Doc",  "desc" : "Key Features",                 "dir" : "", "file": "KeyFeatures" },
        {"class":"Doc",  "desc" : "Large Scale Computing",        "dir" : "", "file": "LargeScale" },
        {"class":"Doc",  "desc" : "Architecture",                 "dir" : "", "file": "Architecture" },
        {"class":"Doc",  "desc" : "Notes on Order Sensitivity",   "dir" : "", "file": "OrderSensitivity" },
        {"class":"Doc",  "desc" : "Notes on Concurrency",         "dir" : "", "file": "Concurrency" },
        {"class":"Doc",  "desc" : "Overview Slide Deck",          "dir" : "", "file": "DataSketches_deck", "pdf":"true" }
      ]
    },
    
    { "class":"Dropdown", "desc" : "Research", "array":
      [
        {"class":"Doc",  "desc" : "Research",                     "dir" : "", "file": "Research" }
      ]
    },
    
    { "class":"Dropdown", "desc" : "Distinct Counting", "array": 
      [

        { "class":"Dropdown", "desc" : "HyperLogLog Sketches", "array":
          [
            {"class":"Doc",  "desc" : "HLL Sketch",                               "dir" : "HLL", "file": "HLL" },
            {"class":"Doc",  "desc" : "HLL vs HLL++",                             "dir" : "HLL", "file": "Hll_vs_Hllpp" },
            {"class":"Doc",  "desc" : "HLL Sketch Java Example",                  "dir" : "HLL", "file": "HllJavaExample" },
            {"class":"Doc",  "desc" : "HLL Sketch Pig UDFs",                      "dir" : "HLL", "file": "HllPigUDFs" },
            {"class":"Doc",  "desc" : "HLL Sketch Hive UDFs",                     "dir" : "HLL", "file": "HllHiveUDFs" },
            {"class":"Doc",  "desc" : "HLL Map Sketch",                           "dir" : "HLL", "file": "HllMap" },
            {"class":"Doc",  "desc" : "HLL Sketch vs Druid HyperLogLogCollector", "dir" : "HLL", "file": "HllSketchVsDruidHyperLogLogCollector" }
          ]
        },
        
        { "class":"Dropdown", "desc" : "Theta Sketches", "array":
          [
            {"class":"Doc",  "desc" : "Theta Sketch Framework",           "dir" : "Theta", "file": "ThetaSketchFramework" },
            {"class":"Doc",  "desc" : "Concurrent Theta Sketch",          "dir" : "Theta", "file": "ConcurrentThetaSketch" },
            {"class":"Doc",  "desc" : "Theta Sketch Java Example",        "dir" : "Theta", "file": "ThetaJavaExample" },
            {"class":"Doc",  "desc" : "Theta Sketch Spark Example",       "dir" : "Theta", "file": "ThetaSparkExample" },
        
            { "class":"Dropdown", "desc" : "KMV Tutorial", "array":
              [
                {"class":"Doc",  "desc" : "The Inverse Estimate",           "dir" : "Theta", "file": "InverseEstimate" },
                {"class":"Doc",  "desc" : "Empty Sketch",                   "dir" : "Theta", "file": "KMVempty" },
                {"class":"Doc",  "desc" : "First Estimator",                "dir" : "Theta", "file": "KMVfirstEst" },
                {"class":"Doc",  "desc" : "Better Estimator",               "dir" : "Theta", "file": "KMVbetterEst" },
                {"class":"Doc",  "desc" : "Rejection Rules",                "dir" : "Theta", "file": "KMVrejection" },
                {"class":"Doc",  "desc" : "Update V(kth) Rule",             "dir" : "Theta", "file": "KMVupdateVkth" },
              ]
            },
        
            { "class":"Dropdown", "desc" : "Set Operations", "array":
              [
                {"class":"Doc",  "desc" : "Set Operations",                 "dir" : "Theta", "file": "ThetaSketchSetOps" },
              ]
            },
        
            { "class":"Dropdown", "desc" : "Accuracy", "array":
              [
                {"class":"Doc",  "desc" : "Basic Accuracy",                 "dir" : "Theta", "file": "ThetaAccuracy" },
                {"class":"Doc",  "desc" : "Accuracy Plots",                 "dir" : "Theta", "file": "ThetaAccuracyPlots" },
                {"class":"Doc",  "desc" : "Relative Error Table",           "dir" : "Theta", "file": "ThetaErrorTable" },
                {"class":"Doc",  "desc" : "SetOp Accuracy",                 "dir" : "Theta", "file": "ThetaSketchSetOpsAccuracy" },
                {"class":"Doc",  "desc" : "Unions With Different k",        "dir" : "Theta", "file": "AccuracyOfDifferentKUnions" },
              ]
            },
        
            { "class":"Dropdown", "desc" : "Size", "array":
              [
                {"class":"Doc",  "desc" : "Theta Sketch Size",                 "dir" : "Theta", "file": "ThetaSize" },
              ]
            },
        
            { "class":"Dropdown", "desc" : "Speed", "array":
              [
                {"class":"Doc",  "desc" : "Update Speed",                      "dir" : "Theta", "file": "ThetaUpdateSpeed" },
                {"class":"Doc",  "desc" : "Merge Speed",                       "dir" : "Theta", "file": "ThetaMergeSpeed" },
              ]
            },
        
            { "class":"Dropdown", "desc" : "Large Scale Computing", "array":
              [
                {"class":"Doc",  "desc" : "Theta Sketch Pig UDFs",             "dir" : "Theta",  "file": "ThetaPigUDFs" },
                {"class":"Doc",  "desc" : "Theta Sketch Hive UDFs",            "dir" : "Theta",  "file": "ThetaHiveUDFs" },
                {"class":"Doc",  "desc" : "Integration with Druid",            "dir" : "",       "file": "DruidIntegration" },
                {"class":"Doc",  "desc" : "Memory Package",                    "dir" : "Memory", "file": "MemoryPackage" },
                {"class":"Doc",  "desc" : "<i>p</i>-Sampling",                 "dir" : "Theta",  "file": "ThetaPSampling" },
              ]
            },
        
            { "class":"Dropdown", "desc" : "Theta Sketch Theory", "array":
              [
                {"class":"Doc",  "desc" : "Theta Sketch Framework (PDF)",      "dir" : "",      "file": "ThetaSketchFramework", "pdf":"true" },
                {"class":"Doc",  "desc" : "Sketch Equations (PDF)",            "dir" : "",      "file": "SketchEquations",      "pdf":"true" },
                {"class":"Doc",  "desc" : "DataSketches (PDF)",                "dir" : "",      "file": "DataSketches",         "pdf":"true" },
                {"class":"Doc",  "desc" : "Confidence Intervals Notes",        "dir" : "Theta", "file": "ThetaConfidenceIntervals" },
                {"class":"Doc",  "desc" : "Merging Algorithm Notes",           "dir" : "Theta", "file": "ThetaMergingAlgorithm" },
                {"class":"Doc",  "desc" : "Theta References",                  "dir" : "Theta", "file": "ThetaReferences" },
              ]
            }
          ]
        },
        
        { "class":"Dropdown", "desc" : "Tuple Sketches", "array":
          [
            {"class":"Doc",  "desc" : "Tuple Sketch Overview",        "dir" : "Tuple", "file": "TupleOverview" },
            {"class":"Doc",  "desc" : "Tuple Sketch Java Example",    "dir" : "Tuple", "file": "TupleJavaExample" },
            {"class":"Doc",  "desc" : "Tuple Sketch Pig UDFs",        "dir" : "Tuple", "file": "TuplePigUDFs" },
            {"class":"Doc",  "desc" : "Tuple Sketch Hive UDFs",       "dir" : "Tuple", "file": "TupleHiveUDFs" },
          ]
        },
        
      ]
    },
    
    
    { "class":"Dropdown", "desc" : "Most Frequent", "array":
      [
        {"class":"Doc",  "desc" : "Frequency Sketches Overview",  "dir" : "Frequency", "file": "FrequencySketchesOverview" },
        
        { "class":"Dropdown", "desc" : "Frequent Item Sketches", "array":
          [
            {"class":"Doc",  "desc" : "Frequent Items Overview",      "dir" : "Frequency", "file": "FrequentItemsOverview" },
            {"class":"Doc",  "desc" : "Frequent Items Java Example",  "dir" : "Frequency", "file": "FrequentItemsJavaExample" },
            {"class":"Doc",  "desc" : "Frequent Items Pig UDFs",      "dir" : "Frequency", "file": "FrequentItemsPigUDFs" },
            {"class":"Doc",  "desc" : "Frequent Items Hive UDFs",     "dir" : "Frequency", "file": "FrequentItemsHiveUDFs" },
            {"class":"Doc",  "desc" : "Frequent Items Error Table",   "dir" : "Frequency", "file": "FrequentItemsErrorTable" },
            {"class":"Doc",  "desc" : "Frequent Items References",    "dir" : "Frequency", "file": "FrequentItemsReferences" }
          ]
        },
      
        { "class":"Dropdown", "desc" : "Frequent Distinct Sketches", "array": 
          [
            {"class":"Doc",  "desc" : "Frequent Distinct Tuples Sketch", "dir" : "Frequency", "file": "FrequentDistinctTuplesSketch" }
          ]
        }
      ]
    },
    
    { "class":"Dropdown", "desc" : "Quantiles & Histograms", "array":
      [
        {"class":"Doc",  "desc" : "Quantiles Overview",                       "dir" : "Quantiles", "file": "QuantilesOverview" },
        {"class":"Doc",  "desc" : "Quantiles Accuracy and Size",              "dir" : "Quantiles", "file": "QuantilesAccuracy" },
        {"class":"Doc",  "desc" : "Quantiles Sketch Java Example",            "dir" : "Quantiles", "file": "QuantilesJavaExample" },
        {"class":"Doc",  "desc" : "Quantiles Sketch Pig UDFs",                "dir" : "Quantiles", "file": "QuantilesPigUDFs" },
        {"class":"Doc",  "desc" : "Quantiles Sketch Hive UDFs",               "dir" : "Quantiles", "file": "QuantilesHiveUDFs" },
        
        { "class":"Dropdown", "desc" : "Quantiles Studies", "array":
          [
            {"class":"Doc",  "desc" : "New KLL sketch and comparison with DoublesSketch", "dir" : "Quantiles", "file": "KLLSketch" },
            {"class":"Doc",  "desc" : "KLL sketch vs t-digest",                           "dir" : "Quantiles", "file": "KllSketchVsTDigest" },
            {"class":"Doc",  "desc" : "Druid Approximate Histogram",                      "dir" : "Quantiles", "file": "DruidApproxHistogramStudy" },
            {"class":"Doc",  "desc" : "Moments Sketch Study",                             "dir" : "Quantiles", "file": "MomentsSketchStudy" },
            {"class":"Doc",  "desc" : "Quantiles StreamA Study",                          "dir" : "Quantiles", "file": "QuantilesStreamAStudy" }
          ]
        },
        
        { "class":"Dropdown", "desc" : "Quantiles Sketch Theory", "array":
          [
            {"class":"Doc",  "desc" : "Optimal Quantile Approximation in Streams",        "dir" : "", "file": "Quantiles_KLL", "pdf":"true" },
            {"class":"Doc",  "desc" : "Quantiles References",                             "dir" : "Quantiles", "file": "QuantilesReferences" }
          ]
        }
      ]
    },
    
    { "class":"Dropdown", "desc" : "Sampling", "array":
      [
        {"class":"Doc",  "desc" : "Reservoir Sampling",               "dir" : "Sampling", "file": "ReservoirSampling" },
        {"class":"Doc",  "desc" : "Reservoir Sampling Performance",   "dir" : "Sampling", "file": "ReservoirSamplingPerformance" },
        {"class":"Doc",  "desc" : "Reservoir Sampling Java Example",  "dir" : "Sampling", "file": "ReservoirSamplingJava" },
        {"class":"Doc",  "desc" : "Reservoir Sampling Pig UDFs",      "dir" : "Sampling", "file": "ReservoirSamplingPigUDFs" },
        {"class":"Doc",  "desc" : "VarOpt Sampling",                  "dir" : "Sampling", "file": "VarOptSampling" },
        {"class":"Doc",  "desc" : "VarOpt Sampling Java Example",     "dir" : "Sampling", "file": "VarOptSamplingJava" },
        {"class":"Doc",  "desc" : "VarOpt Sampling Pig UDFs",         "dir" : "Sampling", "file": "VarOptPigUDFs" },
      ]
    },
    
    { "class":"Dropdown", "desc" : "Memory Package", "array":
      [
        {"class":"Doc",  "desc" : "Memory Package",                           "dir" : "Memory", "file": "MemoryPackage" },
        {"class":"Doc",  "desc" : "Memory Package Performance",               "dir" : "Memory", "file": "MemoryPerformance" }
      ]
    },
    
    { "class":"Dropdown", "desc" : "Command Line", "array":
      [
        {"class":"Doc",  "desc" : "Creating Command Line Executables",  "dir" : "CommandLine", "file": "CommandLine" },
      ]
    },
    
    { "class":"Dropdown", "desc" : "Who Uses & License", "array":
      [
        {"class":"Doc",  "desc" : "Who Uses",                           "dir" : "",            "file": "WhoUses" },
        {"class":"Doc",  "desc" : "License",                            "dir" : "ROOT",        "file": "LICENSE" },
      ]
    },

  ]
}