XData Blocks
Because XML is often a useful way to represent structured data, InterSystems IRIS classes include a mechanism that allow you to include well-formed XML documents, for any need you might have. To do this, you include an XData block, which is another kind of class member.
InterSystems IRIS uses XData blocks for certain specific purposes, and these might give you ideas for your own applications:
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WS-Policy support for InterSystems IRIS web service services and web clients. See Creating Web Services and Web Clients. In this case, an XData block describes the security policy.
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In Business Intelligence, you use XData blocks to define cubes, subject areas, KPIs, and other elements.
For more details, see Defining and Using XData Blocks.
