Complexity 7 +/- 2
  If we have 7 prepare a new level in the hierarchy
  If we have 9 stop and re-think

Reduce copying.  If possible copy 128 or fewer things.

Node attributes are stored in arrays.
Access an element in the attribute array by creating
a pointer to the specific attribute type structure.
The attribute structures are defined in the file of the operations:
paragraph.h, paragraph.c