Two basic data processing concepts are described: data elements (consisting of bits, bytes, fields, records, and files) and binary characters (standards, hex value, and extended character sets--Greek letters, superscripts, and subscripts). Use of machine-readable data in the OCLC-MARC database is noted. (EJS)

Discussion of XML (extensible markup language) and the traditional DTD (document type definition) format focuses on efforts of the World Wide Web Consortium's XML schema working group to develop a schema language to replace DTD that will be capable of defining the set of constraints of any possible data resource. (Contains 14 references.) (LRW)

Enumerates principal management objectives of database management systems (data independence, quality, security, multiuser access, central control) and criteria for comparison (response time, size, flexibility, other features). Conventional database management systems, relational databases, and database machines used for backend processing are…