Cannot raise warnings using validation rules

[SimonCockx]

This is an enhancement request.

Sometimes, my type system can detect expressions that are technically allowed, but are superfluous or can be written in a better way. In these cases, I would like to give a warning. Validation rules in XSemantics currently don't support this.

Adding syntax similar to error "error description" would resolve this, e.g.,

warning "warning description"
    source sourceObject

[LorenzoBettini]

That's interesting. I'll try to work on that