2 files changed, 12 insertions, 0 deletions
diff --git a/src/client/documents/DocUtils.ts b/src/client/documents/DocUtils.ts
index dee929c89..9704867d5 100644
--- a/src/client/documents/DocUtils.ts
+++ b/src/client/documents/DocUtils.ts
@@ -587,6 +587,15 @@ export namespace DocUtils {
         doc.onClick = FollowLinkScript();
     }
 
+    /**
+     * iterate through all items and their children and return a flat list of leaf placeholder content Docs
+     * @param items
+     * @returns list of placeholder content Docs
+     */
+    export function unwrapPlaceholders(items: Doc[]): Doc[] {
+        return items.flatMap(d => (d.$type === DocumentType.COL ? unwrapPlaceholders(DocListCast(d[Doc.LayoutDataKey(d)])) : [d]));
+    }
+
     export function LeavePushpin(doc: Doc, annotationField: string) {
         if (doc.followLinkToggle) return undefined;
         const context = Cast(doc.embedContainer, Doc, null) ?? Cast(doc.annotationOn, Doc, null);
diff --git a/src/client/documents/Documents.ts b/src/client/documents/Documents.ts
index 4ad9c9bd8..aea636040 100644
--- a/src/client/documents/Documents.ts
+++ b/src/client/documents/Documents.ts
@@ -331,6 +331,9 @@ export class DocumentOptions {
     toolType?: string; // type of pen tool
     expertMode?: BOOLt = new BoolInfo('something available only in expert (not novice) mode');
 
+    placeholder_docType?: STRt = new StrInfo('type of document that this document accepts as a child', false, false, Array.from(Object.keys(DocumentType)));
+    placeholder_acceptTags?: List<string>;
+
     contextMenuFilters?: List<ScriptField>;
     contextMenuScripts?: List<ScriptField>;
     contextMenuLabels?: List<string>;