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Containers are attributes that have additional attributes nested within them.
A Parent Container is a container attribute that does not exist within another container. A Child Container is a container that exists within another container. A value set is the group of attribute values within an instance of a container attribute.
The Nesting ID relates Parent and Child container values. The first digit of the Nesting ID represents a unique set of Parent Container values. Subsequent digits (Nesting ID components) indicate the relationship of child container value sets to higher level container value sets. Each additional level of Child Container adds a Nesting ID component. All container value sets within the same higher level value set require unique Nesting ID component values.
| Container Level | Value Output |
| Parent Container 1 | 1 |
| Child Container 1 of Parent 1 | 1.1 |
| Child Container 2 of Child 1 of Parent 1 | 1.1.2 |
| Child Container 5 of Child 2 of Child 1 of Parent 1 | 1.1.2.5 |
Note: The first Parent Container value set for an item is assigned ‘1’ as the first digit of the Nesting ID. For each additional Parent Container value set for the same item, increase the first digit of the Nesting ID by 1.