label

Find a labelled line (Owner: …) with line label=, and check its value with mask=.

Docking computer: Wrong port shape. No seal. Try again.

Quick reference

Written asFails withApplies to
label=…—line
mask=…label-line-mismatch error
missing-line error
value-wrong-form error
not-done error
value-not-given error
value-not-allowed error
unknown-entity error		line

Examples

label

The literal line prefix a line leaf's mask= inspects (case-insensitive match at line start).

mask

Validate every labeled line in the line leaf against a value mask — malformed values fail per line, absent stays silent, required demands at least one matching line. Requires a sibling label=.

A status from the allowed set passes

contract.mdv.md
<!-- mdv: section required -->
## Status
<!-- mdv: line required label="Status:" mask="<word|oneOf:[Active, Blocked]>" -->
document.md
## Status

Status: Active

✓ passes

A status outside the set is flagged

contract.mdv.md
<!-- mdv: section required -->
## Status
<!-- mdv: line required label="Status:" mask="<word|oneOf:[Active, Blocked]>" -->
document.md
## Status

Status: Pending

✗ value-not-allowed error · line 3

A missing labelled line is flagged

contract.mdv.md
<!-- mdv: section required -->
## Status
<!-- mdv: line required label="Status:" mask="<word|oneOf:[Active, Blocked]>" -->
document.md
## Status

The crew is fine.

✗ missing-line error · line 3

title

Rules on the document's title: present, in the right form, not a placeholder, specific enough.

lang

Require a code fence to declare a language, or one of a set.

On this page

Quick referenceExampleslabelmaskA status from the allowed set passesA status outside the set is flaggedA missing labelled line is flagged