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

# EDGE-1 — A handle encodes the node, the direction and the port

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

A wire carries no declared type. Everything the system deduces about it, it deduces from the two handles, so how a handle is spelled and split is grammar, not detail.

## The rule

> **Normative.** This is the rule.
>
> 1. A port handle is spelled `{nodeId}-{input|output}-{portName}`.
>
> 2. The port name is everything following the first `-input-` or `-output-` marker in the handle, so a port name may itself contain a direction marker.
>
> 3. Classification by port is an exact suffix match, never a substring match: a handle that merely contains a reserved port suffix is not classified by it unless the handle ends with it.

## Related rules

- Names: EDGE-3, EDGE-4
- Referenced by: EDGE-3, EDGE-4, EDGE-6

---

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.