Marshaller and demarshaller sections
====================================

Marshaller and demarshaller sections are used to serialize content in XML data
of update it from it with the help of Marshall 1.0.0 Plone product. The
marshaller section blueprint name is ``quintagroup.transmogrifier.marshaller``
and the demarshaller section blueprint name is
``quintagroup.transmogrifier.demarshaller``.

Marshaller needs relative path to the object to serialize in XML format.
Demarshaller needs path and XML data for updating object. Both sections use
Marshall products internals and serialize/deserialize content with the use of
``atxml`` component (this is not Zope 3 component, Marshall calls it's handlers
components).

Both sections has ``path-key`` option which specify key in item where path to
object is stored (``_path`` is default) and ``files-key`` option that gives
key where XML data will be or is stored. Marshaller section also has ``exclude``
option that give global list of Archetypes fields to exclude on serializing and
``exclude-key`` option, that specifies key where same list per item is stored
(default is ``_excluded_fields``). Fields that are in any of these lists are
excluded.

>>> import pprint
>>> marshall = """
... [transmogrifier]
... pipeline =
...     marshallsource
...     marshall
...     demarshaller
...     printer
...     
... [marshallsource]
... blueprint = quintagroup.transmogrifier.tests.marshallsource
... 
... [marshall]
... blueprint = quintagroup.transmogrifier.marshaller
... exclude =
...     text
... 
... [demarshaller]
... blueprint = quintagroup.transmogrifier.demarshaller
... 
... [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': ('file', 'image'),
 '_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'}
{'_files': {'marshall': {'data': 'xml', 'name': '.marshall.xml'}},
 '_path': 'spam/eggs/notatcontent'}
>>> pprint.pprint(plone.marshalled)
(('spam/eggs/foo', ('text', 'image', 'file')), ('topic/criterion', ('text',)))
>>> pprint.pprint(plone.demarshalled)
('spam/eggs/foo', 'topic/criterion')
>>> pprint.pprint(plone.indexed+plone.criterion.indexed)
('spam/eggs/foo', 'topic/criterion')
>>> plone.updatedRoles
True
>>> plone.reindexed
True
>>> plone.fields['effectiveDate']
'changed'
>>> plone.criterion.fields['effectiveDate']
'not changed'