An Array represents a JSON array (an ordered list of values).
Arrays have the following property:
Arrays have the following accessors:
jdm:size($a as array()) as xs:integer
Returns the number of values in the array $a.
jdm:value($a as array(), $i as xs:integer) as item()
Returns the value at position $i in the array $a.
An Array does not have a typed value.
