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private func parsePublication(at url: URL) -> PubBox? {
    do {
      guard let (pubBox, parsingCallback) = try Publication.parse(at: url) else {
        return nil
      }
      let (publication, container) = pubBox
      // TODO: SIMPLY-2840
      // Parse .ncx document to update TOC and page list if publication doesn't contain TOC
      // -- the code below should be removed as described in SIMPLY-2840 --

      if publication.tableOfContents.isEmpty {
        publication.otherCollections.append(contentsOf: parseNCXDocument(in: container, links: publication.links))
      }
      // -- end of cleanup --

      items[url.lastPathComponent] = (container, parsingCallback)
      return (publication, container)
    } catch {
      log(.error, "Error parsing publication at '\(url.absoluteString)': \(error.localizedDescription)")
      return nil
    }
  }
}