The basic 15 elements of DCMI are normally given a dc: namespace, but supplemental terms and refinements are generally placed in the dcterms: namespace.

DCMI 15个基本元素通常放在dc：名称空间中，但是追加的术语和细化通常放在dcterms：名称空间中。

youdao

Translation: Engage Twitterers on their terms, make them happy using supplemental promotions but don't turn it into a mirror of your other promotional channels.

FORBES: Magazine Article