# Semantic validation

> Validate answers against natural-language constraints — 'must be a Swedish org number' — checked at submit, not just regex.

_Adaptive intake · forms.ax help · updated 2026-07-18 · https://forms.ax/help/adaptive/semantic-validation_

## Ask your assistant

- "Validate the org number field - it must be a valid Swedish organization number."

Every field type carries its structural validation automatically — email format, number and rating bounds, choice membership, text length. Semantic validation goes further: attach a plain-language constraint to a field and it's checked when the respondent submits.

Examples that work well:

- "must be a Swedish organization number"
- "should be a company name, not a person's name"
- "must describe a physical address in Sweden"

Failed checks show the respondent a clear message on the field. Like all adaptive features it's capped per plan and degrades gracefully — a constraint check never strands a respondent.

## FAQ

**How is this different from required or format checks?**
Structural checks (required, email format, number bounds) are built into field types and always free. Semantic validation understands meaning and runs through the AI layer.

Related: [update_field](https://forms.ax/help/tools/update_field) · [create_form](https://forms.ax/help/tools/create_form)