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

# DYN-1 — Dynamic ports are opt-in, and a node that does not opt in has none

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

Dynamic ports let an author add connection points to one node instance beyond what its processor declares. Nothing gets them by accident: a node type has to ask for them, and the definitions start empty.

## The rule

> **Normative.** This is the rule.
>
> 1. A node type opts a node in to dynamic ports.
>
> 2. The opt-in declares two reserved parameters, one holding the node's dynamic input port definitions and one its dynamic output port definitions, each a list whose default is empty.
>
> 3. A node that has not opted in has no dynamic ports.

---

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.