---
id: R7.c
family: GR-VAL
level: core
profiles: [storage-api, editor-client]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-val/r7-c
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# R7.c — A node instance decides which of its ports are exposed

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

One chain answers "is this port exposed?" everywhere it is asked: for edges and for the workflow's exposure map alike.

## The rule

> **Normative.** This is the rule.
>
> 1. A port's effective exposure on a node is the instance's own `config.ports[].exposed` value where the instance sets one, and otherwise the port's `exposedByDefault` in the node type's metadata.
>
> 2. Exposing a port on the instance therefore makes an edge to or from it legal that would otherwise be refused.

## Related rules

- Names: R7.a, R7.b, R10
- Referenced by: R7.a, R7.b, R10

---

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.