Marshall section
================

The marshall section blueprint name is
``quintagroup.transmogrifier.marshall``.

Marshall needs at least 1 piece of information: the path to the object
to update. To determine the path, the marshall section inspects each
item and looks for one key, as described below. Any item missing this piece of
information will be skipped. Similarly, items with a path that doesn't exist
or are not Archetypes objects will be skipped as well.

For the object path, it'll look (in order) for
``_plone.app.transmogrifier.atschemaupdater_[sectionname]_path``,
``_plone.app.transmogrifier.atschemaupdater_path``, ``_[sectionname]_path``
and ``_path``, where ``[sectionname]`` is replaced with the name given to the
current section. This allows you to target the right section precisely if
needed. Alternatively, you can specify what key to use for the path by
specifying the ``path-key`` option, which should be a list of keys to try (one
key per line, use a ``re:`` or ``regexp:`` prefix to specify regular
expressions).

Paths to objects are always interpreted as relative to the context.

>>> import pprint
>>> marshall = """
... [transmogrifier]
... pipeline =
...     marshallsource
...     marshall
...     printer
...     
... [marshallsource]
... blueprint = quintagroup.transmogrifier.tests.marshallsource
... 
... [marshall]
... blueprint = quintagroup.transmogrifier.marshall
... 
... [printer]
... blueprint = collective.transmogrifier.sections.tests.pprinter
... """
>>> registerConfig(u'quintagroup.transmogrifier.tests.marshall', marshall)
>>> transmogrifier(u'quintagroup.transmogrifier.tests.marshall')  # doctest: +REPORT_NDIFF
{'_excluded_fields': ('fieldone', 'fieldtwo'),
 '_files': {'marshall': {'data': 'marshalled', 'name': '.marshall.xml'}},
 '_path': 'spam/eggs/foo'}
{'_files': {'marshall': {'data': None, 'name': '.marshall.xml'}},
 '_path': 'topic/criterion'}
{'_path': 'not/existing/bar'}
{}
{'_path': 'spam/eggs/notatcontent'}
>>> pprint.pprint(plone.exported)
(('spam/eggs/foo', ('fieldone', 'fieldtwo')), ('topic/criterion', ()))