PSPZap uses five files (including transform) as follows:

The transform file defines the mapping between the source construct file and the target construct file. It also identifies how data in the input file is transferred into the output data file, and how it should be manipulated when this is done. The content of the transform file is highly dependent upon the content of the two construct files (source and target).

All transform files have the same layout, and can be edited using any text editor. Each record in a transform file has four components: transform identifier, source construct description, target construct description and construct map. A typical record looks like this:

Briefly, the above record defines a mapping between the source construct Comp and a target construct COMP. This is the default mapping as identified by the transform identifier Z. The construct map specifies that the transform proceeds by referencing lower-level transform records for the second, first and third components (in that order) of the source construct.

There is a lot of flexibility in transform records, particularly in the construct map component. The PSPZap User Guide provides much more detail on how you define transform records and their components. Both transform and construct files may include comments and blank lines, so can be quite easy to read.