In librarianship field the most popular standards for describing of bibliographic units and forming of bibliographic records are MARC and UNIMARC. In the development of librarian information systems, based on these standards, XML technology is used more and more, as one of leading technologies in a field of storing and exchanging electronic information. The survey of significant projects on digital libraries which are based on bibliographic standards and usesage of XML technologies for modeling and implementing the system is presented in this paper.