community/gsoc/project_ideas: Split into subpages.

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+[[meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]]
+
+[[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled
+[[GNU_Free_Documentation_License|/fdl]]."]]"""]]
+
+[[meta title="Lexical .. Resolution"]]
+
+For historical reasons, [[UNIX]] filesystems have a real (hard) `..` link from each
+directory pointing to its parent. However, this is problematic, because the
+meaning of "parent" really depends on context. If you have a symlink for
+example, you can reach a certain node in the filesystem by a different path. If
+you go to `..` from there, UNIX will traditionally take you to the hard-coded
+parent node -- but this is usually not what you want. Usually you want to go
+back to the logical parent from which you came. That is called "lexical"
+resolution.
+
+Some application already use lexical resolution internally for that reason. It
+is generally agreed that many problems could be avoided if the standard
+filesystem lookup calls used lexical resolution as well. The compatibility
+problems probably would be negligable.
+
+The goal of this project is to modify the filename lookup mechanism in the Hurd
+to use lexical resolution, and to check that the system is still fully
+functional afterwards. This task requires understanding the filename resolution
+mechanism. It's probably a relatively easy task.
+
+See also [[GNU_Savannah_bug 17133]].
+
+Possible mentors: ?
+
+Exercise: Make some modification to the name lookup mechanism. (More specific
+suggestions welcome... :-) )