For AI agents: the complete documentation index is available at https://a3s-lab.github.io/UI/en/llms.txt, the full documentation bundle is available at https://a3s-lab.github.io/UI/en/llms-full.txt, and this page is available as Markdown at https://a3s-lab.github.io/UI/en/components/form-system/schema-profile-1.md.
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      • Schema Profile 1

      The next compiler requires a3s.dev/form-schema-profile/1. This is a closed subset of JSON Schema 2020-12: the headless runtime, browser adapters, Compiler Worker, CLI, and fixed-digest workflow validation all use the same semantics. Behavior outside the profile fails compilation.

      Supported features

      AreaSupported features
      Core$schema, $id, type, title, description, default, enum, const
      Objectsproperties, required, and boolean or Schema-form additionalProperties
      Arraysitems, minItems, maxItems, structural uniqueItems
      StringsminLength, maxLength, Unicode pattern, and approved format values
      Numbersminimum, maximum, and positive multipleOf values

      Approved formats are email, uri, date, date-time, time, hostname, ipv4, ipv6, and uuid.

      multipleOf controls both numeric validation and the step of native number inputs. Decimal multiples use a tolerance comparison, so multipleOf: 0.1 correctly accepts 0.3.

      Profile 1 does not accept $ref, Schema combinators, conditional Schemas, tuple Schemas, or unevaluated-property keywords. The compiler does not silently ignore them; it reports schema.keyword.unsupported with the exact JSON Pointer.

      Every successfully compiled FormPlan contains:

      {
  "apiVersion": "a3s.dev/form-plan/v1alpha1",
  "schemaProfile": "a3s.dev/form-schema-profile/1"
}

      See the Profile 1 specification for value semantics, exclusions, and complete examples.