Name:	Physics and Astronomy Classification Scheme ®
Publisher:	American Institute of Physics
Type:	Taxonomy
Categories:	Astronomy, Physics
Description:	The Physics and Astronomy Classification Scheme ® is designed to assist in the retrieval of information. It is a hierarchical subject classification scheme designed to classify and categorize the literature of physics and astronomy for journal subject indexes, catalogs, computerized databases, and online journals. PACS enables the indexes and databases from physics, astronomy and related fields to be cumulated together and searched efficiently under a single coherent scheme, and can be used either alone or in combination with keywords or free-language text for retrieval.
Total Terms:	4000
Top Terms:	10
Preferred Terms:
Non-Preferred Terms:
Relationships:
Levels:	4
Notation Scheme:	Yes
Notation Description:	Alphanumeric codes arranged by subdivision of the whole spectrum of subject matter in physics- and astronomy-related sciences into segments and then repeating the process of subdivision down to four levels.
Relationship Types:	Hierarchical
Notes Fields:
Multilingual:	No
Languages:	English
Additional Information:	Both the print and online versions are available and updated every 2 years; the online version is updated a few months before the print version, in approximately September of the prior year. For the 2005 print version, a fifth level will be added to the hierarchy (the code structure will remain as-is).
Revision Cycle:	Every 2 years
Last Updated:	2003
Formats:	Download - HTML, Download - Other, Download - PDF, Print Publication, Public Website
Informational URL:	http://www.aip.org/pacs/
Online/Download URL:	http://www.aip.org/pacs/pacs03/pacs03-toc.html or http://www.aip.org/pacs/pacs03/all.txt