improve model validation

Registered by gordon chung

we need to beef up is_valid() methods to ensure model conforms to standard

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Status:
Started
Approver:
gordon chung
Priority:
Medium
Drafter:
None
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Started
Milestone target:
None
Started by
gordon chung

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