Interpretation of multiple values

Many TAN elements contain multiple values or have attributes that allow multiple values. Do those multiple values represent intersection, union, or distribution? For example, attribute="A B" could be interpreted to mean, using the diagram below, anywhere in y (intersection); anywhere in x, y, or z (union); or somewhere x or y and somewhere in y and z (distribution).

Figure 3.1. Venn%20diagram.jpeg

Venn%20diagram.jpeg

Multiple values in TAN are defined according to perceived common usage in ordinary English:

Union (= x, y, or z; default). Examples: anything that takes the the section called “IRI + name Pattern”, <equate>, <period>, <where>.

Intersection (= y only). Examples: @adverb and other qualifications of claims. For example, "...probably not..." does not mean "...probably..." and "...not..."

Distribution (= x or y and y or z). @affects-element, @claimant, @object, <object>, @src, @subject, <subject>, @verb. For example, "[Source A], [source B], are Z" means "Source A is Z" and "Source B is Z."

The discussion above does not treat the important question of range. If an assertion is made about A, is it true for one point in x or y, or is it true for any and all points in x and y? At present, TAN does not address this ambiguity, and leaves the interpretation open.