Double-click the tFileOutputMSXML component to open the dedicated interface or click the [...] button on the Basic settings vertical tab of the Component tab.
To the left of the mapping interface, under Linker source, the drop-down list includes all the input schemas that should be added to the multi-schema output XML file (only if more than one input flow is connected to the tFileOutputMSXML component).
And under Schema List, are listed all columns retrieved from the input data flow in selection.
To the right of the interface, are expected all XML structures you want to create in the output XML file.
You can create manually or easily import the XML structures. Then map the input schema columns onto each element of the XML tree, respectively for each of the input schemas in selection under Linker source.