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+.. _hello_traversal_chapter:
+
+Hello Traversal World
+=====================
+
+.. index::
+   single: traversal quick example
+
+Traversal is an alternative to URL dispatch which allows Pyramid applications
+to map URLs to code.
+
+If code speaks louder than words, maybe this will help. Here is a single-file
+Pyramid application that uses traversal:
+
+.. literalinclude:: hellotraversal.py
+   :linenos:
+
+You may notice that this application is intentionally very similar to the
+"hello world" application from :doc:`firstapp`.
+
+On lines 5-6, we create a trivial :term:`resource` class that's just a
+dictionary subclass.
+
+On lines 8-9, we hard-code a :term:`resource tree` in our :term:`root factory`
+function.
+
+On lines 11-13, we define a single :term:`view callable` that can display a
+single instance of our ``Resource`` class, passed as the ``context`` argument.
+
+The rest of the file sets up and serves our :app:`Pyramid` WSGI app.  Line 18
+is where our view gets configured for use whenever the traversal ends with an
+instance of our ``Resource`` class.
+
+Interestingly, there are no URLs explicitly configured in this application.
+Instead, the URL space is defined entirely by the keys in the resource tree.
+
+Example requests
+----------------
+
+If this example is running on http://localhost:8080, and the user browses to
+http://localhost:8080/a/b, Pyramid will call ``get_root(request)`` to get the
+root resource, then traverse the tree from there by key; starting from the
+root, it will find the child with key ``"a"``, then its child with key ``"b"``;
+then use that as the ``context`` argument for calling
+``hello_world_of_resources``.
+
+Or, if the user browses to http://localhost:8080/, Pyramid will stop at the
+root—the outermost ``Resource`` instance, in this case—and use that as the
+``context`` argument to the same view.
+
+Or, if the user browses to a key that doesn't exist in this resource tree, like
+http://localhost:8080/xyz or http://localhost:8080/a/b/c/d, the traversal will
+end by raising a KeyError, and Pyramid will turn that into a 404 HTTP response.
+
+A more complicated application could have many types of resources, with
+different view callables defined for each type, and even multiple views for
+each type.
+
+.. seealso::
+
+    Full technical details may be found in :doc:`traversal`.
+    
+    For more about *why* you might use traversal, see
+    :doc:`muchadoabouttraversal`.