[DRAFT] Node and Model Item Serializers

[nikitawootten-nist]

Committer Notes

Progress:

• Happy path serialization of an assembly with fields and flags
• Happy path deserialization of an assembly with fields and flags
• Handle JSON-key
• Handle JSON-value-key
• Handle list types and JSON collapsible property
• Validate min occurs
• Validate max occurs
• Handle XML wrapping
• Choice (de)serialization

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Changes to Core Features:

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