Initializing help system before first use

# Reflection and the Model Schema

The data schema for every scenario in the app is represented by the model schema and model entity objects.

    var view = insight.getView();
    var app = view.getApp();
    var schema = app.getModelSchema();
    var myarray = schema.getEntity(‘myarray’);

There are three entity types supported by Xpress Insight. These are:

- Scalars: Single data items.
- Sets: A single dimension collection of unordered data items.
- Arrays: A single or multi-dimensional associative array of data items where the possible index values for a given dimension of the array are represented by a set entity.

Each scalar, set, and array entity has a further type for the data value or values residing in the entity. The main value types are BOOLEAN, INTEGER, REAL, STRING, DECISION_VARIABLE and CONSTRAINT. Xpress Insight adds several more value types (VARIABLE_TYPE, CONSTRAINT_TYPE, MODEL, and PROBLEM_STATUS) to represent the augmented data it collects. Parameters are represented as an array(string) of strings.

The union of entity and data types is enumerated by the `insight.enums.DataType` namespace.

The type of an entity is returned by `getType`. For scalar entities, this returns a value type. For set entities, this returns SET. For array entities this returns ARRAY. In both cases, the value type of the entity can be queried with `getElementType`.

Parent Topic Advanced Topics

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