This Standard specifies the volume and file structure of compact read only optical disks (CD-ROM) for the interchange of information between users of information processing systems. This Standard specifies ? the attributes of the volume and the descriptors recorded on it; ? the relationship among volumes of a volume set; ? the placement of files; ? the attributes of the files; ? record structures intended for use in the input or output data streams of an application program when such data streams are required to be organized as sets of records; ? three nested levels of medium interchange; ? two nested levels of implementation; ? requirements for the processes which are provided within information processing systems@ to enable information to be interchanged between different systems@ utilizing recorded CD-ROM as the medium of interchange; for this purpose it specifies the functions to be provided within systems which are intended to originate or receive CD-ROM which conform to this Standard.