Main entry [主款目]
Svenonius (20001)) 認為主款目(main entry)的定義混亂而分歧，包含了以下三種不同的定義：
A description of a document, in particular its full description (a meaning that is now obsolete);
The attribute of a document by which it is most often accessed, its so-called main access point, such as a person, corporate body, or title.
A work, which is designated either by a normalized name title or by a normalized title.