Validates a prepared document against the 2025.10 format: structural issues from preparation, then every group and token in document order. Alias resolution and $extends merging arrive in Milestone 4; composite values in Milestone 5.
$extends
Validates a prepared document against the 2025.10 format: structural issues from preparation, then every group and token in document order. Alias resolution and
$extendsmerging arrive in Milestone 4; composite values in Milestone 5.