Schema validation for custom import configuration #6871
Description
Is your feature request related to a problem? Please describe.
With 4.x it is now possible to execute a schema validation for at least SRU based import catalogue configurations. If you use a custom catalogue definition there is currently now way to execute a schema validation.
Describe the solution you'd like
It should be possible to put inside a Kitodo directory (schema) one or more schema files (xsd) which can be selected in custom import catalogue configuration and used on importing data from this custom catalogue. Maybe this custom schema files need a namespace selection to so the application knows on which namespace this custom schema file should be applied as already this happens hard coded for existing schema validations. This could maybe result in that even the currently hard coded namespace to schema file get visible and maybe even editable.