---
id: SCH-44
family: GR-SCHEMA
level: extended
profiles: [storage-api, editor-client]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-schema/sch-44
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# SCH-44 — A shape refines another declaration of its lane; four ids are reserved

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

## The rule

> **Normative.** This is the rule.
>
> 1. Where two sources declare the same lane id, the site's own declaration wins over a code-declared shape, and both win over the shipped entry.
>
> 2. The winner replaces the entry whole rather than key by key, because a partial shape is a deliberate redefinition.
>
> 3. A collision with a shipped id is therefore not a break: the lane stays in the vocabulary, stays self-compatible, and keeps its derived rules.
>
> 4. Precedence is resolved in one place, so which declaration wins never depends on load order.
>
> 5. The ids `trigger`, `tool`, `mixed` and `any` are reserved (every generated compatibility rule in the payload is built from them), and a shape naming one is ignored rather than fatal, since paths that reach around a form exist and one bad shape must not unwire every canvas.

## Related rules

- Names: SCH-10.a, SCH-41, SCH-42
- Referenced by: SCH-10.a, SCH-42, SCH-45

---

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.