Clarification on roundpos function in XML file

Hi, I was going through the list of functions available for use in the XML file when I noticed this:

Can anyone shed light on what is the purpose of these functions? I checked in the XML pdf documentation but I find no mention of it and it appears that there is no clear explanation on what this does. I've seen it being used in one of the examples provided before but there is no clear purpose of this function. Thanks.

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