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据Catalogablog报道（USEMARCON Plus），大英图书馆开发的马克转换工具USEMARCON (Version 1.71)开始提供免费下载。（看起来）这是一个很好的工具，能够转换目前世界各国采用的大约五十种不同的MARC格式（同样的MARC也有那么大的互操作问题！），我还没看到它是否支持CNMARC，但从介绍材料和说明书上看它提供了合理的流程和开放的方法可以支持用户转换规则进行转换。该软件的早期版本提供源码，可自行修改编译，但需要特定的Cpp环境。目前的版本源自芬兰赫尔辛基国家图书馆，具有灵活的批处理功能，号称能够与任何ILS软件整合/搭配使用。

USEMARCON is a software application that allows users to convert bibliographic records from one MAchine-Readable Cataloguing (MARC) format to another. Approximately fifty variant MARC formats are currently in use throughout the world. The differences between the MARC formats present a barrier to the easy exchange of records. This is a fundamental problem for libraries, and necessitates the costly re-cataloguing of material for which records are already available, but in a MARC format other than their own…..

USEMARCON facilitates the conversion of catalogue records from one MARC format to another e.g. from UKMARC to UNIMARC. The software was designed as a toolbox-style application, allowing users with detailed knowledge of the source and target MARC formats to develop rules governing the behaviour of the conversion. Rules files may be supplemented by additional tables for more accurate conversion of MARC-specific character sets or coded information. The tables and rules files are simple ASCII text files and can be created using any standard text editor such as MS Windows Notepad.