---
id: R4.c
family: GR-VAL
level: core
profiles: [storage-api]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-val/r4-c
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# R4.c — An exposure entry must name a node that exists

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

## The rule

> **Normative.** This is the rule.
>
> 1. A workflow exposure entry's `node_id` must name a node in the workflow.
>
> 2. An entry that does not is refused at `schema.{side}.{index}`, and the entry's remaining checks are skipped, since none of them can be decided without the node.

## Related rules

- Names: R4.a, R4.d
- Referenced by: R4.a

---

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.