To manage multiple languages, you need to define the ISO code for the language in the tag field.
Here is an example where the product is created in English and French:
<advancedimporter>
<product supplier-reference="demo-1">
<name lang="en">Name</name>
<name lang="fr">Nom</name>
<price>0</price>
</product>
</advancedimporter>
If later another feed no longer contains the “lang” tag, the field will be the same in all languages:
<advancedimporter>
<product supplier-reference="demo-1">
<name>Name</name>
<price>0</price>
</product>
</advancedimporter>