columns

Navigator: The star chart has columns for a reason.

Quick reference

Written as	Fails with	Applies to
`columns.has=…` autofix	`table-columns-mismatch` error	`table`
`strict` fix: opt-in	`table-extra-columns` error	`table`

Require the table to contain these columns, in order; extra columns are allowed (add strict to forbid them).

contract.mdv.md

<!-- mdv: section required -->
## Crew
<!-- mdv: table columns.has=[Name, Role] -->
| Name | Role |
| ---- | ---- |
| Ines | Pilot |

document.md

## Crew

| Name | Role | Shift |
| ---- | ---- | ----- |
| Ines | Pilot | Night |

✓ passes

contract.mdv.md

<!-- mdv: section required -->
## Crew
<!-- mdv: table columns.has=[Name, Role] -->
| Name | Role |
| ---- | ---- |
| Ines | Pilot |

document.md

## Crew

| Name | Shift |
| ---- | ----- |
| Ines | Night |

Reject header columns not listed in columns.has=; written as strict on a table, and without columns.has= it has no effect.

contract.mdv.md

<!-- mdv: section required -->
## Crew
<!-- mdv: table columns.has=[Name, Role] strict -->
| Name | Role |
| ---- | ---- |
| Ines | Pilot |

document.md

## Crew

| Name | Role | Shift |
| ---- | ---- | ----- |
| Ines | Pilot | Night |

contract.mdv.md

<!-- mdv: section required -->
## Crew
<!-- mdv: table columns.has=[Name, Role] strict -->
| Name | Role |
| ---- | ---- |
| Ines | Pilot |

document.md

## Crew

| Name | Role |
| ---- | ---- |
| Ines | Pilot |

✓ passes

See also: Validate a status table