1[1]Susan Haigh. A Glossary of Digital Library Standards, Protocols and Formats, May 6 1998: www. nlc -bnc. ca/pubs/netnotes/notes54. htm
2[2]Nancy Brodie. Collaboration among National Libraries in the Preservation of Digital Information, National Library News,Vol.31, No.3 -4
3[3]Marc Fresko. Digital Preservation Guidelines:The State of the art in Libraries mnseums and archives, European Communites 1998: www. echo. lu/digicult/en/backfrd. html
4[4]Research Libraries Group. 16 July 1999, R (G - )LF Task Force on Policy & Practice for long. term Retention of Digital Materials: www.rlq. orq/preserv/digirliqdif99. html
5[5]The SGML/XML: www. oasis-orq/cover/StteDesc. html
