表身份、职业或职位的名词作同位语时，其作用是对前面的名词作补充说明，具有补足语的特性，等同于非限制性定语从句who is (the) publisher of this journal，其前的定冠词（或不定冠词）是可有可无的。夸克《英语语法大全》（P.374）中就有类似的例句：

Anne Martin, (the) star of the TV series and (the) author of a well-known book on international cuisine, has resigned from her post on the Consumer Council.