I'm looking for a description of each of the different icons that are used for representing the links between schemas. There is nothing in the Campaign Classic documentation that describes what the links represent. There is of course the 2 most obvious ones, which are the blue one-to-one link and the orange one-to-many link, but there are others that are less common. For example a grey link that looks like the one-to-one link, the blue and orange one-to-many link. Is there information somewhere in that provides the description of all the possible link types?