an array generated by phpDocumentor_parse_ini_file() containing an index 'Linked Tutorials' with an array of tutorial names in the order they should appear. This is used to generate a linked list of tutorials like phpDocumentor tags
link to the parent tutorial in a document series, or false if none
This is used to generate an "Up" or "Home" link like the php manual. The parent is defined as a tutorial that has a parenttutorialname.ext.ini file and is not contained by any other tutorial's tutorialname.ext.ini