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# System

This document covers the following topics:

- System Maintenance

- System Retrieval

- System Active Retrieval

## System Maintenance

The System Maintenance Menu is called with the command `MAINTAIN SYSTEM`.

### Overview of Functions and Commands

Function | Code | Command
--- | --- | ---
Add a system | A | ADD SYSTEM
Copy system | C | COPY SYSTEM
Modify system | M | MODIFY SYSTEM
Rename system | N | RENAME SYSTEM
Purge system | P | PURGE SYSTEM
Display system | D | DISPLAY SYSTEM
Link children | L | LINK SYSTEM <active-association-type>
Edit owners of a system | O | EDIT SYSTEM OWNER
Select system from a list | S | SELECT SYSTEM
Edit description of a system | W | EDIT SYSTEM DESCRIPTION

### Parameters

Keyword | Field | Position
--- | --- | ---
ID | System ID | 1
<> | Copy ID | 2

### System-specific Maintenance Commands

System objects are processed using Standard Maintenance Commands.

## System Retrieval

The System Retrieval Menu is called with the command `RETRIEVE SYSTEM`.

### Overview of Functions and Commands

Retrieval Type | Code | Default Output Mode | Command
--- | --- | --- | ---
Systems | D | D | DISPLAY SYSTEM
L | LIST SYSTEM
S | SELECT SYSTEM
D | SHOW SYSTEM
Execute retrieval models | E | T | EXECMODEL SYSTEM
Dummy/Placeholder systems | C | L | DUMMY SYSTEM <passive-association-type>
Systems with parents | B | D | PARENTS SYSTEM <passive-association-type>
Systems with no parent | O | L | FREE SYSTEM ANY | ALL | <passive-association-type>
Systems with children | T | D | CHILDREN SYSTEM <active-association-type>
Systems with no child | U | L | EMPTY SYSTEM ANY | ALL | <active-association-type>

### Parameters

Keyword | Field | Position
--- | --- | ---
ID | System ID | 1
TYPE | System of type | 2
RES | Restrictions | 3
MODEL | Model | 4
OUT | Output options | 5
LIB | Library | 6
FNR | User system Fnr | 7
DBNR | User system DBnr | 8
MODE | Output mode | 9

### System-specific Retrieval Commands

System objects are processed with Standard Retrieval Commands.

## System Active Retrieval

The System Active Retrieval Menu is called with the command `ACTIVE SYSTEM`.

### Overview of Functions and Commands

Retrieval Type | Code | Default Output Mode | Command
--- | --- | --- | ---
Systems | D |  | see Retrieval
Systems containing programs | P | L | CONTAINING PROGRAM
Libraries | I | L | LIST LIBRARY
S | SELECT LIBRARY
Systems not implemented | N | L | Note:XIST SYSTEM
Libraries not documented | O | L | UNDEFINED LIBRARY
Libraries with members | T | L | ELEMENTS LIBRARY
Systems containing programs | P | L | CONTAINING PROGRAM

### Parameters

Keyword | Field | Position
--- | --- | ---
ID | System ID | 1
LIB | Library | 2
RES | Restrictions | 3
OUT | Output options | 4
TYPE | System of type | 5
FNR | User system Fnr | 6
DBNR | User system DBnr | 7
LIB-STRUCTURE | Library structure | 8
MODE | Output mode | not possible

### System-specific Active Retrieval Commands

Command | Description
--- | ---
LIST LIBRARY | Lists the implemented libraries. If the library is documented, the corresponding system is also indicated. If not, the following text appears: >>>library not documented<<<.
SELECT LIBRARY | Produces the same list as LIST LIBRARY. A library can be selected for further processing from this list.
Note:XIST SYSTEM | Lists systems that are documented but do not correspond to an implemented library.
UNDEFINED LIBRARY | Lists libraries that are implemented but have no corresponding system object in Predict.
ELEMENTS LIBRARY | Lists libraries with members. If a member is documented, the corresponding program is also indicated. If not, the member is marked >>>>not documented<<<<.
CONTAINING PROGRAM | Lists systems with programs which are linked or for which XRef data exist in the documented library. Predict 3.2 XRef data is evaluated.

### On this page

- System Maintenance
- System Retrieval
- System Active Retrieval