First of all, I created an old_blog folder where to store migrated content. I intend to create new object keeping old ones as references.

Quills blog post are registered as "WeblogEntry" portal types. So I got all these posts by searching the portal_catalog for portal_type="WeblogEntry".

Once I have this entries list, I can iterate over each element, create a new "News Item" object in the old_blog (context) directory, and fill it with original metadata.

In addition to standard object properties like id, Title, Description, Creation/Effective/ModificationDate, WeblogEntry store its content inside a Text or RawText field. You can verify this by yourself by typing http://...WeblogEntry addrr.../getRawText in a browser. So we now have almost complete access to WeblogEntry data. I will discart Subject (topics) and comments. Not a big loss for me!

Last but not least, the object must be re-indexed in the plone site catalog.

# -*- coding: utf-8 -*-
"""Quills to NewsItem migration script
mythsmith 11/2009"""

request = container.REQUEST
RESPONSE =  request.RESPONSE

# List all legacy WeblogEntry objects:
entries=context.portal_catalog.searchResults(
        portal_type="WeblogEntry")

for et in entries:
	obj=et.getObject()
	print obj.id
	
	# Create the newsitem object
	context.invokeFactory(
                type_name="News Item",
                id=obj.id,title=obj.Title())
        # Find the new object
	nobj = getattr(context,obj.id)
	# Set its format, content and description
	nobj.setTitle(obj.Title())
	nobj.setFormat('text/html')
	nobj.setText(obj.getRawText())
	nobj.setDescription(obj.Description())
	nobj.setModificationDate(obj.modified())
	nobj.setEffectiveDate(obj.effective())
	nobj.setCreationDate(obj.created())
	nobj.indexObject()
return printed

Finally I can uninstall Quills!