OPL models

You can build OPL models in Decision Optimization model builder in Watson Studio.

To create an OPL model in the model builder select Create>OPL in the model selection window. You can also import OPL models from a file or import a scenario zip file containing the OPL model and the data. If you import from a file or scenario zip file, the data must be in .csv format. You can however import other file formats that you have as project assets into the model builder. You can also import data sets including connected data into your project from the model builder in the Prepare data view.

Inputs and Outputs

In an OPL model, you must declare a tupleset for each table that you have imported in the Prepare data view using the same name. The schema for each tupleset must have same number of columns as the table and use the same field names. For example, if you have an input table in your Prepare data view called Product with the attributes name, demand, insideCost, and outsideCost, your OPL model must contain the following:
tuple TProduct {
   key string name;
   float demand;
   float insideCost;
   float outsideCost;

{TProduct}     Product = ...;
Similarly if you want to display a table in the Explore solution view, you must define a tupleset for this output table in your OPL model. For example, this code will produce a output table with 3 columns in the solution.
/// solution
 tuple TPlannedProduction {
   key string productId;
   float insideProduction;
   float outsideProduction; 

You can find this example OPL model for a pasta production problem in the Model_Builder folder of the DO-samples. You can download and extract all the samples. Select the relevant product and version subfolder.

For more information about the OPL language see