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"myFoundset": "foundset",
"childElements" : { "type" : "component[]", "elementConfig" : {"forFoundset": "myFoundset"} }

Have a look at 'component' page to see how these two properties above will look like in browser js.

'Configuration' object for sending several "foundset aware" types as viewPorts (Note: the "forFoundset" usage for "dataprovider" and "tagstring" types is not yet implemented in first 8.0 public alpha):

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