role indicator

role-indicator的词性：
n.Computer Science （名词）【计算机科学】

1. In information retrieval, a code that is assigned to a key word to indicate the part of speech or function of the word in the text where it occurs.
作用指示符：一种在信息检索时指定给某一关键词以表示文本中出现的单词的读法或功能的密码