---
id: SCH-1
family: GR-SCHEMA
level: core
profiles: [storage-api, editor-client]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-schema/sch-1
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# SCH-1 — A node's ports come from its two declared schemas

*GR-SCHEMA (Part I) · level: core · profiles: storage-api, editor-client · added in 1.0*

Everything an editor draws on a node (its input ports and its output ports) is derived from two schemas the node type declares. Nothing else is a source.

## The rule

> **Normative.** This is the rule.
>
> 1. A node type declares its input surface as one JSON Schema and its output surface as another.
>
> 2. Those two schemas are the only source of a node's ports.
>
> 3. The node type's own registration declaration carries no port data and no visual data: a port list, an icon or a category appearing there is a defect.

---

Rule identifiers are permanent and are never renumbered. This specification carries
no implementation status: each implementation publishes its own standing against
these rules. Licensed CC BY 4.0.