code: function deleteRecursive (kb, folder) {
          return new Promise(function (resolve, reject) {
            kb.fetcher.load(folder).then(function () {
              let promises = kb.each(folder, ns.ldp('contains')).map(file => {
                if (kb.holds(file, ns.rdf('type'), ns.ldp('BasicContainer'))) {
                  return deleteRecursive(kb, file)
                } else {
                  console.log('deleteRecirsive file: ' + file)
                  if (!confirm(' Really DELETE File ' + file)) {
                    throw new Error('User aborted delete file')
                  }
                  return kb.fetcher.webOperation('DELETE', file.uri)
                }
              })
              console.log('deleteRecirsive folder: ' + folder)
              if (!confirm(' Really DELETE folder ' + folder)) {
                throw new Error('User aborted delete file')
              }
              promises.push(kb.fetcher.webOperation('DELETE', folder.uri))
              Promise.all(promises).then(res => { resolve() })
            })
          })
        }
docs: For deleting an addressbook sub-folder eg person - use with care!