
Chapter 1 XML Model Basics
Selecting extended model definitions at model creation
Extended model definitions (.XEM files) provide means for customizing and extending PowerDesigner metaclasses, parameters and generation. Extended model definitions are typed like models in PowerDesigner. You create an extended model definition for a specific type of model and you cannot share these files between heterogeneous models.
When you create a new XML model, or when you reverse engineer into a new XML model, you can select one or several extended model definitions and attach them to the model from the New dialog box.
You can choose one of the following options:
Option | Description |
Share | Current extended model definition constantly refers to the extended |
| model definition stored in the Resource Files\Extended Model |
| Definitions directory. Any changes made to the extended model |
| definition are shared by all linked XEM |
Copy | Current extended model definition is a unique copy of the extended |
| model definition stored in the Resource Files\Extended Model |
| Definitions directory. The current extended model definition is |
| independent of the original one, so modifications made to the |
| extended model definition in the Resource Files\Extended Model |
| Definitions directory are not available to the copied XEM. This one |
| is saved with the XML model and cannot be used without it |
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