But as we hope we've shown in the table, that really represents an array with a single element whose value is null, not a null array. 但是,正如我们希望的,在表中已经显示,它真正表示的是含有单一元素的数组,元素的值为“零”(null),而不是一个“零”(null)数组。
When an array variable is NULL or when the element being assigned is in a position beyond the current cardinality, all the elements between the old last element and the new one are implicitly assigned the NULL value. 在阵列变量为NULL或被指定的元素位于超过当前基数的位置上时,最古老的元素和新元素之间的所有元素都被隐式分配NULL值。
For each element of the array, the demo_xml.tpl template generates an XML element containing the value retrieved from the array. demoxml.tpl会为数组中的每一个元素生成包含从数组查询到的值的XML元素。
For example, in the array pictured in Fig.8.2 elements are identified by a row number and a column number, and row 1, column 3 ( element 1,3) contains the value 29. 例如,在图8.2的数组中,元素用行号和列号区别,第一行第三列包含的值是29。