---
id: LANG-22
family: GR-LANG
level: core
profiles: [runtime]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-lang/lang-22
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# LANG-22 — An extraction error fails the node and never takes the default

*GR-LANG (Part I) · level: core · profiles: runtime · added in 1.0*

## The rule

> **Normative.** This is the rule.
>
> 1. When an extraction fails (a path the engine cannot evaluate, an engine failure), the node fails and the failure routes to the error edge, naming the path and the engine.
>
> 2. The configured default is not substituted on an error; it applies only where the expression evaluated cleanly and found nothing.

## Related rules

- Names: LANG-24, LANG-29
- Referenced by: LANG-24, LANG-29

---

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.