MS word XML mapping, repeating section control

<?xml version="1.0" encoding="utf-8"?>
<books>
  <book>
    <title>Word Programmierung</title>
    <authors>
      <author>Cindy Meister</author>
      <author>Christian Freßdorf</author>
    </authors>
    <publisher>Microsoft Press</publisher>
    <isbn>000</isbn>
  </book>
  <book>
    <title>XML Pocket Consultant</title>
    <authors>
      <author>William Stanek</author>
    </authors>
    <publisher>Microsoft Press</publisher>
    <isbn>111</isbn>
  </book>
   <book>
    <title>.NET Development for Office</title>
    <authors>
      <author>Andrew Whitechapel</author>
    </authors>
    <publisher>Microsoft Press</publisher>
    <isbn>111</isbn>
  </book>
    <book>
    <title>Visual Studio Tools for Office 2007</title>
    <authors>
      <author>Eric Carter</author>
      <author>Eric Lippert</author>
    </authors>
    <publisher>Addison Wesley</publisher>
    <isbn>000</isbn>
  </book>
</books>

Set rng = doc.Tables(1).Rows(2).Range
    doc.SelectContentControlsByTitle("Title").Item(1).XMLMapping.SetMapping _
      "//title"
    doc.SelectContentControlsByTitle("Publisher").Item(1).XMLMapping.SetMapping _
      "//publisher"
    doc.SelectContentControlsByTitle("ISBN").Item(1).XMLMapping.SetMapping _
      "//isbn"
    doc.SelectContentControlsByTitle("Author").Item(1).XMLMapping.SetMapping _
      "//author"
    doc.SelectContentControlsByTitle("Authors").Item(1).XMLMapping.SetMapping _
      "//authors/author"
    Set ccRepSec = rng.ContentControls.Add(Word.WdContentControlType.wdContentControlRepeatingSection, rng)
    ccRepSec.XMLMapping.SetMapping "//books/book[./isbn = '000']"
    MapContentControls = True