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rationale Rationale
Identifies why this milestone exists, what problem it is solving, and/or what object
cannot be modeled using the regular hierarchy.
OPTIONAL on elements: <milestone-end>, <milestone-start>
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | The reason for a milestone or information about an object that cannot be modeled using the regular hierarchy. |
| Restriction | This is an optional attribute; there is no default. |