A useful typology needs a hierarchical structure, therefore a grouping of similar forms is necessary. In most cases a differentiation of the basic field pattern will do it. Only a distinction between charged and uncharged flags has to be added. An example is given in FDB no.12, p.14., where such a typology was applied for Belgian municipal flags, and in no.13, p.14. The division lines for the types B, C, D must not be straight ones, they could be also wavy, zig-zag or any other kind of continuos lines.
Type D icludes ascending lines as well descending ones.
Type E is not restricted to a symmetric division, others are also possible. Type G comprises crossed bars in the shape of a Latin cross and a Scandinavian cross or a saltire. It is chosen as a special type, because these patterns occur very often on flags. It also could have been included in type E. Type H represents mixed patterns or such which wouldn't suite to the previous mentioned ones. This simplified typology wouldn't be sufficient in cases where the distribution over these 8 types is extremely unbalanced.