Within the Dutch food, health and beauty industry agreements have been reached on which product data should be exchanged using GS1 Data Source.
Online tool: the Attribute Explorer
The Attribute Explorer lists all Benelux attributes, an instruction, example and remarks. All code lists are included as well. It enables for example all mandatory attributes for consumer units to be shown and you may search attribute types.
Additional explanations concerning packaging for example are (for now) presented as individual documents (in Dutch). These are listed below including a summary of all attributes.