Feature request: Print the field name which doesn't in the error message "java.lang.Exception: Field not present" does not list which

[andrawaag]

When writing ShExML files for many fields, sometimes I add many fields at the same time. When parsing it is not immediate visible which Field name is incorrect, often caused by an unseen space in the field name.
Is it possible to print which field is causing the error name?

[herminiogg]

As commented in the other issue (#145) this is something concerning a semantic analysis of the input. I will treat them together when I undertake the semantic analysis development. Then, you can indeed expect more user friendly errors.