I have done an experimental reworking of the Discogs guidelines into a set of generic guidelines that should apply to all databases. You can see them at http://www.filmo.gs/wiki/General-Generic-Guidelines-For-All-Databases
They are intended to achieve accuracy,consistency, and ease of data entry between databases. They are divided into two main section – rules, and guidelines. Rules must be followed, guidelines are best practices that should be worked towards.
It is expected that the individual databases will need supplementary guidelines specific to their topic and fields.
They are a work in progress. Please feel free to amend them if you can see an area for improvement, any and all input and feedback would be much appreciated.