Help me apply JSON Schema to the material below.
Reader and existing knowledge: [describe]
Task and desired outcome: [describe]
Use these principles: Declare the schema dialect.; Separate required presence from the allowed type and value.; Check actual instances with a validator that supports the chosen dialect..
Preserve source facts, identifiers, quantities, conditions, exceptions, and uncertainty.
Separate supplied facts from assumptions. Ask for missing information instead of inventing it.
Explain your representation choices and provide a review checklist. Do not claim formal compliance or correctness from formatting alone.
Material: [paste only information you are permitted to share]