bool map problems solved.
(now operator[] gives back 'std::vector<T>::reference' rather that 'T&')
     2 <!ENTITY legal           SYSTEM "legal.xml">
 
     3 <!ENTITY fdl             SYSTEM "fdl.xml">
 
     4 <!ENTITY preface         SYSTEM "preface.xml">
 
     5 <!ENTITY start           SYSTEM "start.xml">
 
     7 <!ENTITY graph-concepts  SYSTEM "graph-concepts.xml">
 
     8 <!ENTITY iterator-concepts  SYSTEM "iterator-concepts.xml">
 
     9 <!ENTITY graph-classes   SYSTEM "graph-classes.xml">
 
    10 <!ENTITY osztaly-forma   SYSTEM "osztaly-forma.xml">
 
    11 <!ENTITY search_iterator   SYSTEM "search_iterator.xml">