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Document ordered_union_data (GeoDMS #1168) New page for the union_data variant with which the modeller states that all values of all unioned attributes are non-decreasing: monotone increasing, but not strictly, so equal successors are allowed, also across the boundary of two arguments. Describes what the GeoDMS does with that statement, that it is verified when the result is calculated and how a violation is reported, that only the numeric value types are supported, and that the GeoDMS generates ordered_union_data itself in the calculation rules it derives for attributes whose values are known to be sorted. Linked from Relational functions and from the union_data page, and dropped the (misspelled) ordererd_union_data entry from the operator coverage worklist.