---
id: EXPO-7
family: GR-EXPO
level: extended
profiles: [storage-api]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-expo/expo-7
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# EXPO-7 — Published schemas carry the flag only where the default is hidden

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

## The rule

> **Normative.** This is the rule.
>
> 1. Where a node type's stored default exposure for a port is false, the schema it publishes carries `x-exposed-by-default: false`.
>
> 2. Where it is anything else, the key is absent from the published schema rather than present and true.
>
> 3. A processor's own value for the key is overwritten either way, so the published schema states the node type's decision and only where it diverges from the exposed default (CFG-2).


## What it means

What a node type publishes states only its own decision, and only where that
decision diverges from the default. A processor's own schema for the same
port is never consulted at publication time and never survives into what
ships — even where the node type's stored value agrees with the processor,
or contradicts it outright, the published schema is built from the stored
value alone.

## Example

```json title="The node type's stored default exposure for the port: false" verdict="hidden"
{ "connectable": true, "exposed_by_default": false }
```

```json title="What that publishes" verdict="materialized"
{ "x-exposed-by-default": false }
```

Where the node type's own stored value is anything else — unset, or an
explicit `true` even against a processor schema that itself declares
`x-exposed-by-default: false` for that port — the published schema carries
no such key at all. A processor's own value for the key never reaches what
publishes; only the node type's stored word does.

## Related rules

- Names: CFG-2, EXPO-5, EXPO-6
- Referenced by: EXPO-5, EXPO-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.