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This section provides a step-by-step example of creating a new model using the procedure described in Build a New Model. The model, Menu, generates a program that displays several choices to a user and allows the user to select one.

Note:
For an example of a generated menu program, refer to NCMAIN in the demo library.

The procedure to build a new model is:

• Step 1: Define the Scope of the Model

• Step 2: Create the Prototype

• Step 3: Scrutinize the Prototype

• Step 4: Isolate the Parameters in the Prototype

• Step 5: Create a Code Frame and Define the Model

• Step 6: Create the Model PDA

• Step 7: Create Translation LDAs and Maintenance Maps

• Step 8: Create the Model Subprograms

• Step 9: Implement the Model

Step 1: Define the Scope of the Model

A program generated by the Menu model will provide a list of options and descriptions to the user for selection. The INPUT statement can be generated by Natural Construct or supplied by the developer.

Step 2: Create the Prototype

After defining the scope of the model, create a prototype to handle the most complex function and then refine the prototype to handle the simpler functions.

The following example shows the output from the NCMAIN prototype:

 NCMAIN                ***** ACME DEPARTMENT STORES *****              NCLAYMN1 
 Oct 09                        - MAIN MENU -                           04:11 PM 
                                                                                
                Code |  Subsystem                                               
              +------+------------------------------------------------+         
              |  C   |  Customer                                      |         
              |  T   |  Table Maintenance                             |         
              |  O   |  Order                                         |         
              |      |                                                |         
              |      |                                                |         
              |      |                                                |         
              |      |                                                |         
              |      |                                                |         
              |      |                                                |         
              |      |                                                |         
              |      |                                                |         
              |  ?   |  Help                                          |         
              |  .   |  Terminate                                     |         
              +-------------------------------------------------------+         
           Code: __                                                             
 Direct Command: ____________________________________________________________   
 Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
       help  retrn quit        flip                                      main   

Step 3: Scrutinize the Prototype

After creating the prototype, follow the steps outlined in Step 3: Scrutinize the Prototype, to ensure that all of the assumptions are correct and the scope of the model has been addressed.

Step 4: Isolate the Parameters in the Prototype

Next, identify data that must be supplied by parameters.

Parameters for the Program Header

The parameters supplied for the program header are:

• Name of the program being generated.

• Application to which the generated program belongs.

• Date and time the program was generated.

• Title and description of the program.

Parameters for the Program Body

The parameters supplied for the program body are:

• Name of the global data area (GDA).

• Map used by the generated program.

• List of functions and their descriptions.

Step 5: Create a Code Frame and Define the Model

This section describes how to create a code frame and define the model.

Create the Code Frame

Once you have identified all data that must be supplied by parameters, you can create the code frame (CMNA?) for the model. For more information, see Create the Code Frames.

Note:
For an example of the code frame for the Menu model, display the CMNA? code frame (stored in the SYSCST library) in the Code Frame editor.

To create the code frame:

1. Read the prototype into the Code Frame editor and define the substitution parameters.

2. Create the user exits.

   To allow developers to specify additional parameters, local data, or Natural statements, include the following user exits:

   User Exit	Description
   CHANGE-HISTORY	Generates comment lines indicating the date and ID of the person who created or modified the program. The developer provides a description of changes.
   LOCAL-DATA	Defines additional local variables used in the generated program.
   START-OF-PROGRAM	Defines code that is executed once at the beginning of the generated program — after all standard initial values are assigned. For example, this user exit code can initialize input values from globals.
   BEFORE-INPUT	Defines code that is executed immediately before the INPUT statement is executed (before each input panel is displayed). For example, this user exit code can issue the SET CONTROL statements.
   AFTER-INPUT	Defines code that is executed immediately after the INPUT statement is executed (after each input panel is displayed).
   BEFORE-PROCESSING-MENU-CODES	Defines code that is executed before the menu code is processed.
   SPECIAL-CODE- PROCESSING	Defines code that is executed when a menu code does not FETCH a program.
   END-OF-PROGRAM	Contains code that is executed once before the program is terminated. For example, this user exit code can assign a termination message.
   SET-PF-KEYS	Defines code that is executed before the PF-keys are set and allows non-standard PF-keys to be added to the program. (The additional PF-keys are defined in the CDKEYLDA local data area.)

3. Create the code frame conditions.

   To create conditional code, insert the condition name and condition level number in the code frame. To view some examples of conditional code, display the CMNA? code frame in the Code Frame editor and refer to the following condition names:

   • GDA-SPECIFIED

   • DIRECT-COMMAND-PROCESSING

   • MAP-USED

Define the Model

At this point, you can define the model to Natural Construct using the Maintain Models function on the Administration main menu. For more information, see Define the Model.

Model subprograms are prefixed by CUMN, where CU identifies the subprogram as a Natural Construct model subprogram and MN identifies the model (Menu).

Note:
The CU prefix is used by the models supplied with Natural Construct. When you create a new model or modify a supplied model, use a CX prefix. For this example, we use a CU prefix.

To add the Menu model to Natural Construct:

1. Invoke the Maintain Models function from the Administration main menu.

2. Specify the following parameters on the Maintain Models panel.

   For example:

   CSDFM N A T U R A L C O N S T R U C T CSDFM0 Oct 09 Maintain Models 1 of 1 Action ..................... __ A,B,C,D,M,N,P,R Model ...................... MENU____________________________ Description ........ *0200.1___________________________________________________ MENU Program PDA name ................. CUMNPDA_ Status window ............ Y Programming mode ......... S_ Comment start indicator .. **_ Type ..................... P Program Comment end indicator .... ___ Code frame(s) ............ CMNA?___ ________ ________ ________ ________ Modify server specificatn CUMNMA__ CUMNMB__ ________ ________ ________ ________ ________ ________ ________ ________ Modify client specificatn CUMNMA__ CUMNMB__ ________ ________ ________ ________ ________ ________ ________ ________ Clear specification ...... CUMNC___ Post-generation .......... CUMNPS__ Read specification ....... CUMNR___ Save specification ....... CUMNS___ Pre-generation ........... CUMNPR__ Document specification ... CUMND___ Command ............ __________________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- help retrn quit frame main

Most of the model components are listed on this panel. The components that are not listed are assigned through subprograms or code frames. For example, the CUMNMA0 and CUMNMB0 maps are invoked through the CUMNMA and CUMNMB maintenance subprograms, respectively, and the generation subprogram is assigned through the CMNA? code frame.

Step 6: Create the Model PDA

Use the CST-PDA model in the Generation subsystem to create the parameter data area (PDA) for the model (CUMNPDA).

For an example of the parameter data area for the Menu model, refer to the CUMNPDA parameter data area in the SYSCST library.

To create the model PDA:

1. Type the following parameter values on the Generation main menu:

   Parameter	Value
   Function	M
   Module	CUMNPDA
   Model	CST-PDA

2. Press Enter.

   The Standard Parameters panel for the CST-PDA model is displayed.

3. Enter "Menu" in Model.

   For example:

   CUPDMA CST-PDA Parameter Data Area CUPDMA1 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNPDA_ Model .............. Menu____________________________ * Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit

   The Generation main menu is displayed.

4. Enter "G" in Function.

   Natural Construct generates the PDA.

5. Enter "E" in Function.

   The Natural data area editor is displayed.

   • Each substitution parameter in the model code frame corresponds to a user area variable in the model PDA that has the same name and a #PDAX- or #PDA- prefix.

   • Each condition variable in the model code frame corresponds to a condition variable in the model PDA that has the same name and a #PDAC- prefix.

6. Specify the type and length of each #PDAX variable.

7. Add any #PDA variables required by the model.

Step 7: Create Translation LDAs and Maintenance Maps

This section describes how to create the translation LDA and maintenance map for your model.

Create the Translation LDAs

To support dynamic translation of text and messages, you can create up to five translation local data areas (LDAs) for each maintenance map; the module that invokes the map must have a translation LDA. Translation LDAs contain the names of the fields on the map that can be translated. To assign the INIT values for these fields, use SYSERR references.

For an example of the translation LDAs for the Menu model, refer to the CU--MAL and CUMNMBL LDAs in the SYSCST library.

The following example shows a translation LDA:

 Local     CUXXMAL   Library SYSCST                             DBID  19 FNR  26
 Command                                                                     > +
 I T L Name                             F Leng Index/Init/EM/Name/Comment       
 All - -------------------------------- - ---- ---------------------------------
   * * **SAG TRANSLATION LDA                                                    
   * * * used by map CUXXMX0.                                                   
     1 CUTRMAL                                                                  
     2 TEXT                                    /* Corresponds to syserr message 
     3 #GEN-PROGRAM                     A   20 INIT<'*2000.1,.'>                
     3 #TITLE                           A   20 INIT<'*2001.1,.'>                
     3 #DESCS                           A   20 INIT<'*2001.2,.'>                
     3 #DATA-AREA                       A   20 INIT<'*2097.3,.'>                
     3 #LANGUAGE                        A   20 INIT<'*1309.2,.'>                
   R 2 TEXT                                                                     
     3 TRANSLATION-TEXT                                                         
     4 TEXT-ARRAY                       A    1 (1:100)                          
     2 ADDITIONAL-PARMS                                                         
     3 #MESSAGE-LIBRARY                 A    8 INIT<'CSTLDA'>                   
     3 #LDA-NAME                        A    8 INIT<'CUXXMAL'>                  
     3 #TEXT-REQUIRED                   L      INIT<TRUE>                       
     3 #LENGTH-OVERRIDE                 I    4 /* Explicit len to translate     
 ----------------------------------------------------------------- S 17   L 1   

To create your translation LDAs

1. Copy an existing translation LDA.

2. Define the fields for which you want dynamic translation.

   All translation LDAs must have the format shown in the example above. For more information, see Step 7: Create the Translation LDAs and Maintenance Maps.

Create the Maintenance Maps

The model uses one or more maintenance maps to accept parameters from a user. To create the maintenance maps, use one of the following methods:

• Copy an existing maintenance map and modify it to suit your requirements.

• Create the map in the Natural Map editor.

• Create the map using the Natural Construct Map model.

For an example of the maintenance maps for the Menu model, refer to the CU--MA0 and CUMNMB0 maps in the SYSCST library.

The CU--MA0 maintenance map contains the following input fields:

The CUMNMB0 maintenance map contains the following input fields:

Step 8: Create the Model Subprograms

After creating the code frame, PDA, maintenance maps, and translation LDAs for the Menu model, you are ready to create the model subprograms. The following sections describe how to create each of the model subprograms:

• Create the Maintenance Subprograms

• Create the Pre-Generation Subprogram

• Create the Post-Generation Subprogram

• Create the Clear Subprogram

• Create the Save Subprogram

• Create the Read Subprogram

• Create the Generation Subprogram

• Create the Documentation Subprogram

• Test the Model Subprograms

Create the Maintenance Subprograms

Use the CST-Modify model in the Generation subsystem to create the maintenance subprograms (CUMNMA and CUMNMB). These subprograms invoke the CUMNMA0 and CUMNMB0 maps, respectively.

For an example of the maintenance subprograms for the Menu model, refer to the CUMNMA and CUMNMB subprograms in the SYSCST library.

To create the CUMNMA maintenance subprogram:

1. Display the Standard Parameters panel for the CST-Modify model.

2. Specify the following parameters:

   CUGIMA CST-Modify Subprogram CUGIMA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNMA__ Parameter data area CUMNPDA_ * Title .............. Menu Model Modify Subp___ Description ........ This subprogram is used as modify panel 1_____________ 1 of 2________________________________________________ ______________________________________________________ ______________________________________________________ Map name ........... CU--MA0_ * Translation LDAs ... CU--MAL_ ________ ________ ________ ________ * Cursor translation . X First header ....... ______________________________________________________ Second header ...... *0311.1,+/54__________________________________________ Subpanel ........... _ Window support ..... _ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- help retrn quit windw pfkey left userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

To create the CUMNMB maintenance subprogram:

1. Display the Standard Parameters panel for the CST-Modify model.

2. Specify the following parameters:

   CUGIMA CST-Modify Subprogram CUGIMA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNMB__ Parameter data area CUMNPDA_ * Title .............. Menu Model Modify Subp___ Description ........ This subprogram is used as modify panel 2_____________ 2 of 2________________________________________________ ______________________________________________________ ______________________________________________________ Map name ........... CUMNMB0_ * Translation LDAs ... CUMNMBL_ ________ ________ ________ ________ * Cursor translation . X First header ....... ______________________________________________________ Second header ...... *0310.1,+/54__________________________________________ Subpanel ........... _ Window support ..... _ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- help retrn quit windw pfkey left userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Pre-Generation Subprogram

Use the CST-Pregen model in the Generation subsystem to create the pre-generation subprogram.

For an example of the pre-generation subprogram for the Menu model, refer to the CUMNPR subprogram in the SYSCST library.

To create the CUMNPR pre-generation subprogram:

1. Display the Standard Parameters panel for the CST-Pregen model.

2. Specify the following parameters:

   CUGPMA CST-Pregen Subprogram CUG-MA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNPR__ Parameter data area CUMNPDA_ * Title .............. Menu Model Pregen Subp Description ........ Pre-generate subprogram. ...__________________________ Set conditions and assign shared PDA variables. _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Post-Generation Subprogram

Use the CST-Postgen model in the Generation subsystem to create the post-generation subprogram.

For an example of the post-generation subprogram for the Menu model, refer to the CUMNPS subprogram in the SYSCST library.

To create the CUMNPS post-generation subprogram:

1. Display the Standard Parameters panel for the CST-Postgen model.

2. Specify the following parameters:

   CUGOMA CST-Postgen Subprogram CUGOMA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNPS__ Model .............. MENU____________________________ * Title .............. Menu Model Post-Gen Subp_ Description ........ Post-generation parameters for the Menu model.________ _______________________________________________________ _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Clear Subprogram

Use the CST-Clear model in the Generation subsystem to create the clear subprogram. The Menu model requires a clear subprogram because the #PDA-USER-AREA field is redefined into non-alphanumeric variables (for example, #PDA-USER-PARM-LENGTH and #PDA-CODE-LENGTH) and the Description field on the first maintenance panel requires default text.

For an example of the clear subprogram for the Menu model, refer to the CUMNC subprogram in the SYSCST library.

To create the CUMNC clear subprogram:

1. Display the Standard Parameters panel for the CST-Clear model.

2. Specify the following parameters:

   CUGCMA CST-Clear Subprogram CUG-MA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNC___ Parameter data area CUMNPDA_ * Title .............. Menu Model Clear Subp____ Description ........ Clear specification parameters and assign initial value ______________________________________________________ _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Save Subprogram

Use the CST-Save model in the Generation subsystem to create the save subprogram. The save subprogram allows the model to read a previously-generated program.

For an example of the save subprogram for the Menu model, refer to the CUMNS subprogram in the SYSCST library.

To create the CUMNS save subprogram:

1. Display the Standard Parameters panel for the CST-Save model.

2. Specify the following parameters:

   CUGAMA CST-SAVE Subprogram CUG-MA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNS___ Parameter data area CUMNPDA_ * Title .............. Menu Model Save Subp_____ Description ........ Save specification parameters for the menu model_______ _______________________________________________________ _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Read Subprogram

Use the CST-Read model in the Generation subsystem to create the read subprogram.

For an example of the read subprogram for the Menu model, refer to the CUMNR subprogram in the SYSCST library.

To create the CUMNR read subprogram:

1. Display the Standard Parameters panel for the CST-Read model.

2. Specify the following parameters:

   CUGRMA CST-Read Subprogram CUG-MA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNR___ Parameter data area CUMNPDA_ * Title .............. Menu Model Read Subp_____ Description ........ Read parameter specifications _____________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Generation Subprogram

Use the CST-Frame model in the Generation subsystem to create the generation subprogram.

For an example of the generation subprogram for the Menu model, refer to the CUMNGGL subprogram in the SYSCST library.

To create the CUMNGGL generation subprogram:

1. Display the Standard Parameters panel for the CST-Frame model.

2. Specify the following parameters:

   CUGFMA CST-Frame Subprogram CUG-MA0 Oct 09 Standard Parameters 1 of 1 Module ............. CUMNGGL_ Parameter data area CUMNPDA_ * Title .............. Menu Model Frame Subp____ Description ........ Generation parameter variables (if length and format are specified)_________________________________________ _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit userX main

3. Generate the subprogram.

   For information, see Natural Construct Generation.

Create the Documentation Subprogram

Use the CST-Document model in the Generation subsystem to create the documentation subprogram.

Note:
For an example of the documentation subprogram for the Menu model, refer to the CUMND subprogram in the SYSCST library.

To create the CUMND documentation subprogram:

1. Display the Standard Parameters panel for the CST-Document model.

2. Specify the following parameters:

   CUGDMA CST-Document Subprogram CUGDMA0 Oct 09 Standard Parameters 1 of 2 Module ............. CUMND___ Model .............. Menu____________________________ * Maps ............... CU--MAO_ CUMNMBO_ ________ ________ ________ * ________ ________ ________ ________ ________ * Translation LDAs ... CU--MAL_ CUMNMBL_ ________ ________ ________ * ________ ________ ________ ________ ________ * Title .............. Menu Model Document Subp_ Description ........ Writes Predict documentation for the Menu model____ _______________________________________________________ _______________________________________________________ _______________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- right help retrn quit right main

3. Press PF11 (right).

   The Additional Parameters panel is displayed.

4. Specify the following parameters:

   CUGDMB CST-Document Subprogram CUGDMB0 Oct 09 Additional Parameters 2 of 2 Help Text .......... Type ..... O Major .... Model___________________________ Minor .... Menu____________________________ Description 1 ______________________________________________________________________ 2 ______________________________________________________________________ 3 ______________________________________________________________________ 4 ______________________________________________________________________ 5 ______________________________________________________________________ 6 ______________________________________________________________________ 7 ______________________________________________________________________ 8 ______________________________________________________________________ 9 ______________________________________________________________________ 10 ______________________________________________________________________ Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- main help retrn quit left userX main

5. Generate the subprogram.

   For information, see Natural Construct Generation.

Test the Model Subprograms

Natural Construct supplies a utility to help test the model subprograms.

To invoke the model subprogram test utility:

1. Log onto the SYSCST library.

2. Enter "CSUTEST" at the Next prompt (Direct Command box for Unix).

   The Single Module Test Program panel is displayed. For information about this panel, see Test the Model Subprograms.

Step 9: Implement the Model

After creating and testing the code frames and model components (data areas, model subprograms, maps, etc.), copy all components to the SYSLIBS library to implement the model.

To implement the model:

1. Invoke the SYSMAIN utility from the Next prompt.

2. Copy all the model components to the SYSLIBS library.

Your new model is now ready for use in the Generation subsystem.

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