<!ENTITY intro                  SYSTEM "Introduction.docbook">
<!ENTITY intro-history          SYSTEM "Introduction/History.docbook">
<!ENTITY intro-copying          SYSTEM "Introduction/Copying.docbook">
<!ENTITY intro-copying-preamble SYSTEM "Introduction/Copying/preamble.docbook">
<!ENTITY intro-docconvs         SYSTEM "Introduction/Docconvs.docbook">
<!ENTITY intro-usage            SYSTEM "Introduction/Repoconvs.docbook">
<!ENTITY intro-feedback         SYSTEM "Introduction/Feedback.docbook">