The Government of the Federal Republic of Germany has announced that "holders of a blue Canadian Travel Document (Convention of 28 July,
1951) do not need a visa for transit and/or short-term stay (tourism,
business)."
This means that refugees in Canada holding an official (issued by the government of Canada) TRAVEL DOCUMENT do not need to have a visa to transit German airports, and that they could be allowed to stay in Germany for a short business or tourist trip.
It is the responsibility of the individual traveler to ensure that their documents are valid for their journey into Germany and the Schengen Zone.