Creating an XML from Excel

First off, I have very little experience with xml.

I need to run a report in Quickbooks and export it to excel and create an xml report from that.  (New Hungarian tax decree).

How would I map it in order to get the correct data?

I was given an xml field definitions, table of descriptions, a table with 3 columns, Invoice information items(invoice export file particulars), definition, and xsd reference.

Please help. File attached, many pages of this.

Brian
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