partreplace(xml, 'dedication', 'dedication')
partreplace(xml, 'foreword', 'preface')
partreplace(xml, 'introduction', 'preface')
-partreplace(xml, 'bibliography', 'chapter')
-partreplace(xml, 'acknowledgments', 'chapter')
+partreplace(xml, 'bibliography', 'appendix')
+partreplace(xml, 'acknowledgments', 'appendix')
log 0, 'place part introduction into <partintro>'
s = xml.xpath("//part/title[text()='The Case Studies']")[0]