Configuration Section

[rapodaca]

Anything other than four-coordinate tetrahedral configuration is not supported.

It might be necessary to introduce atom index as a property in the Constitution section, for use here and in Conformation.

• relative arrangement of neighbors in space
• template-based system
  • Clockwise or Counterclockwise
• atomic property
• model
  • sight along edge with lowest index, toward central atom
    • determine the order of edge indexes
    • clockwise or counterclockwise
    • virtual hydrogen counts as edge with lowest index
• limitations
  • can not represent sulfoxide configuration
• operations
  • swaps and their effect on parity
    • virtual hydrogen <-> neighbor hydrogen
    • two neighbors
• examples
  • cyclic, acyclic
  • allene, cumulene
  • include errors
    • degree != 4