srcTW.addCategory(new CategoryPath("Author", "Rob Pike"));
srcTW.addCategory(new CategoryPath("Aardvarks", "Bob"));
srcTW.close();
DirectoryTaxonomyWriter destTW = new DirectoryTaxonomyWriter(dest);
OrdinalMap map = randomOrdinalMap();
destTW.addTaxonomy(src, map);
destTW.close();
validate(dest, src, map);