It seemed you don’t has any attributes in your xml schema? You should take a look for your xsd that the schema there is correctly set up.
If the schema is working, you need to add the entities that you provide to the mapping which contain the data you want to provide and map them to the right place.
You need to build the data structure in the datamodel for your specific case. Then you map the structure in the data model. After that you need to implement the logic in the code, that means you need to create the objects and associations for the mapping as it should be and then send it to the datamodel. So in case of a 1-* you need to build the related associations between your objects in your domain model and implementation.
I have already got the XSD correctly imported and the entity configured. The question is specifically this : if an element in the XSD has an occurrence of more than 1 ( refer screenshot below) , I should be able to create a export XML mapping where this element repeats. Refer the element called Infocard in the screenshot below taken from Mendix desktop modeler 7.23.2.
Can't you use map automatically? https://docs.mendix.com/refguide/map-automatically