They are often used to indicate how the speaker thinks that the content of the sentence relates to the participants' common knowledge.

The contents relate to an investigation I'm conducting into the matter of the death of a very fine man.

Scope: This site provides content on missions, events, education, people and other things related to the exploration of the planets in our solar system.

Where the content of the assemblages relates only to one product, they are more correctly termed an industry.

The content of the project must relate to biotechnology and its various applications.

The shared content and activities often relate to TV content.

Their content is chiefly matter relating to church history, or to ecclesiastical statistics.

Its content relates to the incidents of the civil war in Lancashire.

The subject matter and content of the statement must "relate to" event or condition.

The content below relates to the Ministry of Justices former responsibilities for this area.