
- https://symfony.com/doc/current/components/serializer.html
- https://www.w3schools.com/xml/xsl_intro.asp
- Eine serializer Mapping-XML-Datei + eine XSLT pro Endpunkt
- Per mime-type kann zwischen XML oder JSON umgeschaltet werden (per serializer)

- generic form type
    - ... from XML
    - ... from doctrine ORM mapping (which is quite similar to XML mapping)
    - ... that auto-detects entity-method's (update / modify / change / setter / ...)
