The sum() function in XML is used to sum up numbers. Its syntax is: sum(expression), where expression is a collection of numeric expressions that require sum. For example, to total the number of all items in an order, you can use the XPath expression: sum(//item/@quantity).
XML Total Code
In XML (Extensible Markup Language) sum() function is used to sum up numbers.
grammar:
<code class="xml">sum(expression)</code>
in:
-
expression: a collection of numeric expressions that require sum.
Example:
The following XML code snippet totals the number of all items in the order:
<code class="xml"><orders> <order> <item quantity="1"></item> <item quantity="2"></item> <item quantity="3"></item> </order> <order> <item quantity="4"></item> <item quantity="5"></item> <item quantity="6"></item> </order> </orders></code>
To get order totals, you can use the following XPath expression:
<code class="xml">sum(//item/@quantity)</code>
The result is:
<code>21</code>
Other notes:
-
sum()function is only suitable for numeric expressions. - If the expression contains a non-numeric value, the value will be ignored.
-
sum()function can accept multiple expressions as parameters, separated by commas. - If the result of all expressions is
0, the result ofsum()function is also0.
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