Natural for VSAM Structure

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# Natural for VSAM Structure

This section describes the components and the structure of the Natural interface to VSAM.

This section covers the following topics:

- Components of Natural for VSAM

- Structure of the Natural Interface to VSAM

## Components of Natural for VSAM

The Natural interface to VSAM consists of the following components:

- The `NVSNUC` module, which is mandatory, environment-independent, and delivered as a load module only.

- The Natural parameters specific to VSAM, defined in the Natural parameter module.

- The I/O module, which is mandatory, differs depending on the actual environment, and is delivered in source form only.

- The modules necessary when running with VSAM system files; they are optional and delivered as load modules only.

- The user exits.

- Callable system services.

Natural for VSAM is fully (E)LPA or SVA-compliant for multiple environments (for example, CICS, Com-plete and batch). The Natural parameter module and the appropriate I/O module must be linked to the front-end module.

## Structure of the Natural Interface to VSAM

### On this page

- Components of Natural for VSAM
- Structure of the Natural Interface to VSAM