What is the render delegate parameter expression meaning?

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Hi,
The karma tab tool create a usdrender_rop1 node. The Render Delegate parameter has an expression.
I check it but can't find any reference or function.
What the expression is driven by? Is it safe to be deleted?

Thanks!

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expression.png (34.4 KB)

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There's actually an expression in there.

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2024-09-08_08-25.png (32.5 KB)

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I got it. The Expression lost because I changed the option by hand.
Thanks for reply.
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