source: src/test/java/weka/classifiers/data/ClassifierTest.arff @ 23

@relation ClassifierTest
@attribute StringAtt1 string
@attribute NominalAtt1 {r, g}
@attribute NumericAtt1 numeric
@attribute StringAtt2 string
@attribute NominalAtt2 {a, b, c, d}
@attribute NumericAtt2 numeric
@data
humpty ,g , 1.0 ,the   ,a ,-2.3
dumpty ,g , 2.0 ,quick ,b ,-3.3
sat    ,r , 3.0 ,brown ,c ,-2.4
on     ,r , 4.0 ,fox   ,d ,-5.3
a      ,g , 5.0 ,jumped,a ,-2.6
wall   ,r , 6.0 ,over  ,b ,-7.3
humpty ,r , 7.0 ,the   ,c ,-2.8
dumpty ,g , 8.0 ,lazy  ,d ,-9.3
had    ,g , 9.0 ,dog   ,? ,-2.0
a      ,r , 9.4 ,?     ,? ,-9.0
great  ,r , 1.4 ,the   ,a ,-8.3
fall   ,g , 2.3 ,quick ,b ,-7.3
all    ,r , 3.3 ,brown ,c ,?
the    ,r , 4.3 ,fox   ,d ,-5.3
kings  ,g , 5.3 ,jumped,? ,-5.6
horses ,g , 6.5 ,over  ,b ,-4.3
and    ,r , 7.5 ,the   ,c ,-3.8
all    ,r , 8.5 ,lazy  ,d ,-2.3
the    ,r , 9.4 ,?     ,a ,-1.0
{0 wall, 2 4.3, 4 d}
{1 g, 3 lazy, 5 3.4}