Merge branch 'sec07_test_fix'
Merge branch 'master' into sec09
add validateTripleStore and its test
add processTriples and its test
Merge branch 'sec09'
add polyToString and its test
add Container and its test
add hierarchicalClass and its test
Merge branch 'sec09'
add flatten Classes and its test
Merge branch 'sec09'
add some functions to flattenClasses and its test
add contain and its test
Merge branch 'sec09'
Merge branch 'master' into sec07_test_fix
nothing