Sample DITA source files in support of ACM-013 ("How does DITA 1.3 Support Content Reuse?")
To test basic examples of DITA reuse using library topics and direct (URL-based) references, open map_reuse.ditamap in your DITA editor.
To test that same library with indirect (key-based) references, open map_reuse_with-keys.ditamap in your DITA editor.