The registry maintains:

• descriptor ID → metadata
• version history
• optional deprecated descriptors
• namespace rules

3.1 Namespace Rules

Descriptors use dot notation:

category.subcategory.field

Examples:

• identity.name.given
• identity.birthdate
• address.country
• license.driver.number
• education.degree.master.field

You can add:

• health.
• work.
• finance.
• custom.

Hierarchical, predictable, easy to map to proofs.