Extensions

Extensions (.xem files) provide means for customizing and extending PowerDesigner metaclasses, parameters, and generation. Extended models can be used to store additional information, or to change model behavior.

When you use the models provided with PowerDesigner, the extensions are present. When you create a new model using the ESP model category set, extensions are applied automatically.

When you create a new model without using the ESP Model categories, or when you have an existing model you can extend it using the PowerDesigner tools and ESP extension files.

• Category Set
  You can set the ESP category set to create any ESP model type.
• Schema Definitions
  A schema definition in the ESP Schema model represents a data stream in ESP.
• Impact and Lineage Analysis
  PowerDesigner provides powerful tools for analyzing the dependencies between model objects.