Returns the sum of the given values. If the values are strings, lists or sequences, their concatenated values are returned.
+ · [value1] · [value2] …
- Zero or more values to sum.
This operator can be used as a union set operation on selectors when this is the value of an extract member, such as in the following example:
extract data + · Select.Selector1 · Select.Selector2
Selector1 finds zero elements and
Selector2 finds one,
Selector2 will be extracted. And if
Selector2 finds zero elements and
Selector1 finds one,
Selector1 is extracted. If both selectors find elements, only the one selected by
Selector1 is extracted, and if none of them find any elements, nothing is extracted. Note that more than two selectors could be included in the sum, in which case only the first or only element selected by all of the selectors together would be extracted.