##Aligning blocks top/bottom
##align block top bottom
##Use the 'top' and 'bottom' attributes to make the block be aligned to the top of another block.
col {
    box A [top=B];
    box E [bottom=D];
}
boxcol: Container [line.corner=round] {
    box B, C, D;
}
A,E -> B,C,D;

