---
links:
  '#151': https://github.com/fedify-dev/drfed/issues/151
  '#166': https://github.com/fedify-dev/drfed/pull/166
---

 -  Added an offline `validateDocument()` API in `@drfed/models/document` for
    the activity base types, all named activity types, Object, Article, Note,
    the five core actor types, and collection/page types. Actor, attribution,
    location, and applicable activity relations accept references or supported
    embedded values, individually or in lists. Diagnostics retain stable
    reasons and original nested field paths. Intransitive activities reject a
    non-null object property. Question is recognized, while poll-specific
    fields remain incomplete pending their dedicated rules. Unimplemented forms
    report incomplete support. Collections check members, counts, page
    navigation, and actor collection links without fetching or changing member
    order. Link and Mention check reference metadata, dimensions, and previews.
    Type recognition uses the shared Fedify version and an explicit list
    of implemented types. Common text and language maps, actor usernames,
    timestamps, and addressing retain original values and diagnostic paths.
    Single-value properties check multiplicity while treating null entries as
    absent. Empty addressing warns and offers an explicit omission preview
    without changing the submitted document. Allowlisted bundled contexts and
    supported inline aliases retain original field/index diagnostics;
    custom properties are preserved as opaque JSON with warnings, including in
    normalization previews, without claiming to validate their semantics.
    Added `prepareDocument()` to report trusted server authority outcomes and
    conflicts with server-owned creation fields, with inspectable previews
    for generated values. Neither entry point allocates identities, determines
    permissions, or saves resources. [[#151], [#166] by Jiwon Kwon]