Do you have the XML Mapper application installed? If you do or can install it then you'll find it normally makes creating an XML Map quite an easy process. If not then you'll have to hand-craft one yourself but you'd need to understand how the XML is structured and how you want it to be represented in your Sas Data Set which is a bit more challenging.
There's a good paper on it here -> https://www.lexjansen.com/nesug/nesug10/ff/ff14.pdf which is from 2010 but I don't think the Mapper application has changed much if at all since then.
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