organization work, of course, have the ability to complete the mission of the network information resource cataloguing. At present library network information resource cataloguing of the tools to MARC and DC, mainly on network resources description should be based on XML format is the DC description. 3.1, MARC MARC format is the U.S. congress librarWoolrich Jacketsy from 1963 to investigate the application of computer cataloguing tools, in 1971, the national bureau will determine the national standard for USMARC, in 1977, the sections (IFLA) issued UNIMARC format, according to the China UNIMARC frame system and content, with the characteristics of the property of China. MARC is used to describe, store, exchange, Woolrich Outletcontrol and retrieval of a set of machine readable bibliographic data standards, it began to mainly is aims at the printed books, to the description of the cataloging network information, is through the field 856 increase in MARC, namely "electronic resources address and access", and the five XX field records resources the method to the format. Its data sWoolrich Arctic Parkatructure rigor, gives a good description of electronic information, especially in the selection of the retrieval point in principle, to ensure that the data of the cable with the unity, be helpful for resource exchange. In addition, this after cataloguing personnel filtering, screening information, to ensure that the data to describe the reliability, compWoolrich Parkaleteness and accuracy. 856 field main records are indexing of digital objects or other related with the electronic resources storage address and access way, is can repeat, essential field, including 27 is field. Professional level of classification and accurate records the two big characteristic will make it occupies a place in the Internet. But with MAWoolrich Arctic ParkaRC format cataloguing Internet costs quite high, and because of network information often change in order to maintain the address, the effectiveness of the field 856 links, it takes quite a lot of money, manpower and time, the speed of the cataloging far couldn't keep up with the growth of the network information resources speed, so the high cost of catalWoolrich Onlineoguing way only applies to some of the most important cataloguing of network resources. 3.2 DC At present the information resource in the Internet the most used cataloging description (Dublin Core tool is DC)-Dublin Core, it is a description of the information resources of international standards, in March 1995, the Dublin Core in Ohio seminar, fifty-Woolrich Jassent
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