chats: assume a single leaf document with messages

chats/rdflib/src/module/ChatsModuleRdfLib.ts

@@ -68,7 +68,7 @@ export class ChatsModuleRdfLib implements ChatsModule {
     const latestDay = await this.fetchLatestSubContainer(latestMonth);
     if (!latestDay) return [];
 
-    const messagesDocument = await this.fetchLatestDocument(latestDay);
+    const messagesDocument = await this.fetchMessagesDocument(latestDay);
 
     return new MessagesDocumentQuery(
       chatNode,
@@ -82,15 +82,15 @@ export class ChatsModuleRdfLib implements ChatsModule {
     return new DateContainerQuery(container, this.store).queryLatest();
   }
 
-  private async fetchLatestDocument(container: NamedNode) {
+  private async fetchMessagesDocument(container: NamedNode) {
     await this.support.fetchNode(container);
 
     const contents = new ContainerQuery(container, this.store).queryContents();
     const files = contents.filter(
       (it) =>
         !this.store.holds(it, rdf("type"), ldp("Container"), container.doc()),
     );
-    const anyDocument = files[0]; // TODO actually get latest
+    const anyDocument = files[0]; // this assumes there is one and only one leaf document containing the chat messages (typically chat.ttl)
     await this.support.fetchNode(anyDocument);
     return anyDocument;
   }