Update the script to validate example CIF files

[vaitkus]

Currently, the action validates all of the CIF dictionaries (*.dic) in the top-most directory (.) against the DDLm Reference (ddl.dic) dictionary. I propose to extend the validation behaviour to validate the provided example CIF files against the given CIF dictionaries. The example file could either be placed in a pre-agreed directory (i.e. examples) or made configurable via a yaml file.

For example, the TopoCif [1] repository has several CIF examples that are placed in the examples directory that would benefit from automatic additional checks.

[1] https://github.com/COMCIFS/TopoCif

Does this seem useful to others as well?

[jamesrhester]

This would be a fantastic enhancement.