MARC Type of record coding
Online text: type "a" (language material)
Online map: type "e" (cartographic)
Online musical sound recording: type "j"
Online interactive multimedia encyclopedia: type "m" (computer file)
Type "m" restricted to: computer software (programs, games, fonts), numeric data, computer-oriented multimedia, online systems or services
Leader/06: code for primary type of content, not electronic carrier: