We have a custom concurrent process and we need to use XML publisher to create a custom report

Concurrent Process based on Projects Expenditure Inquiry form

Apps 12.1.3.x

We have a custom concurrent process which we are using to output the expenditure inquiry form data. We need to put the output in XML format. The documentation says we need a template, but I haven't found information on how to create the template. I would appreciate information on how to create the XML template.