Using InterSystems Development Environments — Atelier and Studio
Adding XData Blocks to a Class
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An XData block is a block of XML code that you can add to your class definition.

You can add an XData block to a class definition in two ways:
To add an XData block using the Class Editor, position the cursor at a blank line and enter an XData declaration:
XData ProductionDefinition
    {
    <Production>
    <ActorPoolSize2/ActorPoolSize>
    </Production>
    } 
Alternatively, you can copy and paste an existing XData block and then edit it.
New XData Wizard
You can invoke the New Projection wizard using the Class > Add > XData. Alternatively, right-click in the Class Inspector and select Add Projection.
The New XData wizard displays a single page prompting you for a name for the XData block and a description. To end, select Finish. Add XML code into the Class Editor window to complete the XData block.
The New XData wizard prompts you for the following information (you can later modify any of these values):
XData Name
(required) Name of the new XData. This name must be a valid name and must not conflict with the name of a previously defined XData.
Description
(optional) Description of the new XData.