||A Column is simply a collection of all the child values, referenced by a common edge, or columnName.
If the columnName references a List or Map, they are collapsed.
||The DataModel class is the root class for managing a collection of
Image instances as table with
columns and rows.
After instantiating a new DataModel,
Column objects can be retrieved that either
filter or narrow the original collection of instances (respectively).
||A Rows instance represents a sub-set of its parents set of "rows".