'Retrieve a \'child\' resource from me.
Implement this to create dynamic resource generation -- resources which
are always available may be registered with self.putChild().
This will not be called if the class-level variable \'isLeaf\' is set in
your subclass; instead, the \'postpath\' attribute of the request will be
left as a list of the remaining path elements.
For example, the URL /foo/bar/baz will normally be::
| site.resource.getChild(\'foo\').getChild(\'bar\').getChild(\'baz\').
However, if the resource returned by \'bar\' has isLeaf set to true, then
the getChild call will never be made on it.
Parameters and return value have the same meaning and requirements as
those defined by L{IResource.getChildWithDefault}.'

def getChild(self, path, request):

    return NoResource('No    such    child    resource.')
