<!ENTITY yaz "YAZ">
<!ENTITY bookinfo SYSTEM "bookinfo.xml">
<!ENTITY chap-introduction SYSTEM "introduction.xml">
<!ENTITY chap-installation SYSTEM "installation.xml">
<!ENTITY chap-zoom SYSTEM "zoom.xml">
<!ENTITY chap-client SYSTEM "client.xml">
<!ENTITY yaz "YAZ">
<!ENTITY bookinfo SYSTEM "bookinfo.xml">
<!ENTITY chap-introduction SYSTEM "introduction.xml">
<!ENTITY chap-installation SYSTEM "installation.xml">
<!ENTITY chap-zoom SYSTEM "zoom.xml">
<!ENTITY chap-client SYSTEM "client.xml">