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