The question about metadata in PCG system

Hello, when I study the “Electric Dreams” (The PCG project), I find when we get attribute, the metadata is needed


I don’t know what is that mean. I think if I want to get value of point’s attribute, I only need point and attribute name. What is the metadata.
Besides, sometimes the example use outmetadata from loop body

Sometimes, the const metadata is used.

I really don’t know why and what difference between them.

Thanks!

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