Overview of the ISIS Database Format
ISIS is a document oriented database, which is very different from more common relational databases.
An ISIS record contains a variable number of fields. Some of the fields occur multiple times. Within a field, it is possible to have sub-fields.
Here is a simple example:
|130||$aThe Annotated Alice $sDefinitive Edition|
|100||$aJohn Tenniel $eillustrator|
|100||$aMartin Gardner $eeditor|
|260||$aNew York, N.Y. :$bW.W. Norton & Co.,$c1984.|