The Great Library of Alexandria is an inspiring story for any Information or BI Manager and we can still learn from it, even after 2 millenia.
Don't insist on strict discipline when it comes to your internal processes' protocols. Instead, try installing a thin support layer above all of your key IT/BI systems. If you allow this layer to become the natural workspace for all of the individuals participating in the processes, the protocols will be respected spontaneously.
Ultimately, every company stands or falls by its people. In the case of data-quality this is doubly true. The crucial factor that determines the success or failure of data-quality improvement is the data-quality manager.
Reference data, enumerations, lists of values, code tables - many different names for sets of permissible values used in data fields. Are they data or metadata?