commonMain/kotlin/kotbase/Document.kt#L40">source</a>)</span></span></div><p class="paragraph">The document's revision id. The revision id in the Document class is a constant while the revision id in the MutableDocument class is not. A newly created Document will have a null revision id. The revision id in a MutableDocument will be updated on save. The revision id format is opaque, which means its format has no meaning and shouldn't be parsed to get information.</p></div><div class="content sourceset-depend