The ACM Computing Classification System (1998) H.3 INFORMATION STORAGE AND RETRIEVAL H.3.0 General H.3.1 Content Analysis and Indexing H.3.2 Information Storage H.3.3 Information Search and Retrieval H.3.4 Systems and Software H.3.5 Online Information Services H.3.6 Library Automation H.3.7 Digital Libraries H.3.m Miscellaneous