---
id: SCH-16
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-16
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# SCH-16 — What each reserved port defaults to on the canvas

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

## The rule

> **Normative.** This is the rule.
>
> 1. The reserved ports default to not exposed (the unified `input` and `output`, the `tool` output, the `error` output and the `loop_back` input), except the `trigger` input and the `trigger` output, which default to exposed.
>
> 2. A node type may override the default per port, and stores only the keys whose value diverges from the default.

## Related rules

- Names: SCH-11, SCH-12, SCH-13, SCH-14, SCH-32
- Referenced by: SCH-8, SCH-11, SCH-12, SCH-13, SCH-14, SCH-15, SCH-32

---

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.