cgi_buffer is a group of libraries that may be used to improve performance of CGI scripts (and other content generation engines) in some circumstances by applying performance-enhancing HTTP mechanisms that are typically not supported by them. Currently, Perl, Python, and PHP4 are supported. The Python library may also be used as a wrapper around another CGI script.
isbn.pl contains a single, simple function which returns a book record from the US Library of Congress based on a single incoming ISBN. It is intended for use in other packages, such as barcode reader drivers, to provide users of those tools with the extensive cataloging metadata librarians have created over the years. It differs from other tools seen so far in that the data returned is in the MARC format, the heavily used, ancient metadata standard originally based on library catalog cards. It thus provides much data in a known syntax via a known query protocol (z39.50, using Zeta), rather than via Web page screen scraping.