Create an object array. If type is not specified and all children are of the same object type, then
an object array type of child is obtained. Use the type to specify a primitive type array, or a
parent class type of the children.
This tag is used to help entering key and value pair to maps. Alternatively, one could add
child objects to a mapentry. The first one would be considered as the key object and the
second one would be the value object.