---
id: R5.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/r5-c
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# R5.c — Every node carries an id

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

A node without an id cannot be referred to by an edge, an exposure entry or a runtime result, so a workflow containing one is refused rather than stored.

## The rule

> **Normative.** This is the rule.
>
> 1. Every node in a workflow must carry a non-empty `id`.
>
> 2. A node whose `id` is absent or empty is refused, and because the node cannot be named the error identifies it by its position in the workflow's node list.

---

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.