Does Oracle offer a standardized upload of XML formatted files?
I thought that the canonical format that is used for XML output, structure = ROWSET/ROW/columname
No, SQL*Loader can only process "flat" files.
One option is to write an XSLT transformation that turns the ROWSET/ROW/column
format into a text file and then import that into the target table.
Another option is to import the XML into a single row, and then use Oracle's XML functions to select a relational result from that staging table and insert it into the real table.