Computer memory comes in a variety of forms, two principle ones being primary memory ("RAM"), and secondary memory ("SS") which includes hard and floppy disks and CD-ROM. Data structures and languages for RAM are core computer science. The Aldat Project is concerned with language and data structures for SS. Secondary storage is distinguished from RAM primarily by the long times required to find data, relative to the times required to transfer it for processing. Different memory organization needs different data structures, algorithms and languages. There are many general-purpose languages for RAM and it is unusual to encounter languages specialized for individual applications. Languages for SS are usually query languages rather than full programming languages, and they are specialized