Validate Reference

[mikaelkalt]

Add Validation for reference / or internal referenz as it is called in the code.

It is mandatory. - I'd recommend to not check the length. @Plattnea suggested a max length of 35 characters which is very PAKT specific.

[lennartx]

Such a check should be handled by the adapter itself. #161

[mikaelkalt]

Well you're right that the adapter should check the length itself, but I'm not sure if it is mandatory. According to #2 it is not really clear to me.

[lennartx]

I'd suggest #2 has to be changed, and that the Pakt-adapter is responsible for anything that goes beyond the standard node validation. I.e. if the field is indeed mandatory for the Pakt-adapter, it'll have to validate it itself.
Other adapter implementations will have other requirements.

[mikaelkalt]

After discussing with @hoehnb this issue will be moved back to the backlog as it would need further discussions. For the moment it is fine if the reference is optional.