Concepts and Terms Used in This Documentation

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# Concepts and Terms Used in This Documentation

> Objects and Types of Code

>   A PAC object is one of the following:

>   - A unit of programming code (for example, a program or subroutine);

>   - A data dictionary definition (for example, a view of a database file);

>   - A user-written error message.

>   Natural views (which can be generated from Predict views) are called data definition modules (DDMs). To accommodate the terminologies used at different sites, they are called views/DDMs in this documentation.

>   An object version is an object that has been compiled in PAC and assigned a version number. An object version is sometimes called a PAC object or versioned object.

>   Source code means a unit of code written in a high-level language, such as Natural. Source code is equivalent to Natural "saved" code.

>   Executable code or executable object means a unit of code that has been compiled and can be translated by Natural. Executable code is equivalent to Natural "cataloged" code.

>   A PAC entity is any of the structures that PAC uses to control or facilitate the movement of objects through the life-cycle.

> Applications, Libraries, and Locks

>   An application is a set of objects that work together to perform a task. Thus, an application object is a component of the application.

>   A Natural library is a set of Natural objects that are stored together; you can add objects to a library or delete objects from it. A lock prohibits access to a library, application, or object.

> System Files

>   System files are PAC, PAA and Adabas files that contain the following (the name of each system file is in parentheses):

>   - Software resources (FNAT)

>   - Application libraries (FUSER)

>   - Predict information (FDIC)

>   - Security information (FSEC)

>   In this documentation, the FUSER file, which contains application objects, is called the user system file. The FDIC file is called the Predict file. In addition to Predict data definitions and cross-reference information, Natural rules and views/DDMs generated from Predict entries are stored in the Predict file. User system files and Predict files are identified in PAC by the database number (DBnr) and file number (Fnr).

>   In addition, there are three system files reserved to PAC and PAA:

>   - The PAC ACF file stores the saved and cataloged code for every version of every object under PAC control. The ACF also stores extended information about object versions and PAC entities.

>   - The PAC PCF file stores cross-reference data, keywords, and the latest version of Natural and Predict objects in the PAC-controlled environment. Natural objects are cataloged and Predict objects are generated in the PCF.

>   - The PAA file stores audit data for production objects.

> Environments and Directories

>   The user environment is the mix of hardware, operating systems, teleprocessing (TP) systems, and database managers (DBMSs) at a site.

>   An application environment or operating environment includes the physical locations where application objects are stored and the operating system, TP system, and DBMS with which they are developed, tested or used.

>   The PAC-controlled environment refers to the PAC ACF and PCF system files and the operating environments that are governed by site-specific procedures defined in PAC.

>   The PAA-controlled environment refers to production environments that are protected and audited by PAA.

>   A Natural directory provides information about the environment in which an object was developed, saved,or cataloged.