Basis data memberikan pengenal unik bernama ''NII Article ID'' (NAID), untuk setiap entri artikel jurnalnya.<ref name="INFOSTA">{{Cite journal|last=大向一輝 (Ohmukai, Ikki)|date=2012|title=System design and data modeling of CiNii articles|url=http://ci.nii.ac.jp/naid/110009544496|journal=The Journal of Information Science and Technology Association|volume=62|issue=11|pages=473–477}}</ref> Mesin pengenal yang berbeda, ''ID Citation NII'' (NCID atau 書 誌 ID) alias ''NACSIS-CAT Record ID'', digunakan untuk pencarian buku.
The database contains more than 15 million articles from more than 3,600 publications.[4] A typical month (in 2012) saw more than 30 million accesses from 2.2 million unique visitors,[5] and is the largest and most comprehensive database of its kind in Japan. Although the database is multidisciplinary, the largest portion of the queries it receives is in the humanities and social sciences field, perhaps because CiNii is the only database that covers Japanese scholarly works in this field (as opposed to the natural, formal, and medical sciences which benefit from other databases).[6]
=== Contoh NCID ===
* The database contains more than 15 million articles from more than 3,600 publications.[4] A typical month (in 2012) saw more than 30 million accesses from 2.2 million unique visitors,[5] and is the largest and most comprehensive database of its kind in Japan. Although the database is multidisciplinary, the largest portion of the queries it receives is in the humanities and social sciences field, perhaps because CiNii is the only database that covers Japanese scholarly works in this field (as opposed to the natural, formal, and medical sciences which benefit from other databases).[6]
** NCID BA04004867 for the 1951 Little, Brown edition and of ''The Catcher in the Rye''
** NCID BB17611495 for the 2010 Penguin edition of ''The Catcher in the Rye''
