1 <!ENTITY chapter04 SYSTEM
"../chapter04/chapter04.xml">
2 <!ENTITY c4-introduction SYSTEM
"../chapter04/introduction.xml">
3 <!ENTITY c4-packages SYSTEM
"../chapter04/packages.xml">
4 <!ENTITY c4-toplevel SYSTEM
"../chapter04/toplevel.xml">
5 <!ENTITY c4-all SYSTEM
"../chapter04/all.xml">
