def add(self, guid, content=None, source=None):
print >>sys.stderr, "Adding '%s' (%s)" % (title, url)
try:
doc = Document.byGuid(guid)
except:
doc = Document(guid=guid, doc_type=self.doc_type)
Link(source=source, target=doc)
if content and not doc.data:
data, tags, vector = self.process(content)
doc.data = data
doc.vector = vector
doc.tags = tags
doc.sync()
return doc
