The Bremen clause is Article 141 of the Basic Law for the Federal Republic of Germany

Basic Law for the Federal Republic of Germany

The Basic Law for the Federal Republic of Germany is the constitution of Germany. It was formally approved on 8 May 1949, and, with the signature of the Allies of World War II on 12 May, came into effect on 23 May, as the constitution of those states of West Germany that were initially included...

, which states:

The sentence there cited says:
It limits the range of application of the constitutional (Basic Law) rule over religious education

Religious education

In secular usage, religious education is the teaching of a particular religion and its varied aspects —its beliefs, doctrines, rituals, customs, rites, and personal roles...

, making it possible to have other types of instruction in some areas of Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

. A well-known example is the "instruction in Biblical

Bible

The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...

 history" in Bremen

Bremen

The City Municipality of Bremen is a Hanseatic city in northwestern Germany. A commercial and industrial city with a major port on the river Weser, Bremen is part of the Bremen-Oldenburg metropolitan area . Bremen is the second most populous city in North Germany and tenth in Germany.Bremen is...

. It is not religious education in the sense of the Basic Law, because its content is not accountable to a religious community

Religious community

A religious community is a community who practice the same religion.In the wider sense it may describe members of one religion who live near or intermingled with members of other religions, who may often mix together in everyday life but worship separately. One might speak of the Catholic...

; therefore it is not a "common affair" (res mixta).