fn:max
The maximum of a sequence of values
Description
The fn:max function finds the maximum of a sequence of values. The $arg sequence can only contain values of one type, or a type derived from it. The one exception is that they can be all numeric (of different numeric types), in which case numeric promotion rules apply. That type must be ordered; it must be possible to compare the values using the < and > operators.
The fn:max function assumes untyped values are numeric unless they are explicitly cast to xs:string. To treat untyped data as strings, use the fn:string function as shown in the last example below.
This description is © Copyright 2007, Priscilla Walmsley. It is excerpted from the book XQuery by Priscilla Walmsley, O'Reilly, 2007. For a complete explanation of this function, please refer to Appendix A of the book.
Arguments and Return Type
| Name | Type | Description |
|---|---|---|
$arg |
xs:anyAtomicType* |
the sequence of values |
$collation |
xs:string |
the collation to use for comparing strings |
| return value | xs:anyAtomicType? |
Examples
<xsl:variable name="ordDoc" select="doc('https://www.datypic.com/functx./input/order.xml')"/> |
| XPath Example | Results |
|---|---|
max( (2, 1, 5, 4, 3) ) |
5 |
max( ('a', 'b', 'c') ) |
c |
max(
(xs:date('1999-04-15'), current-date()) ) |
The current date |
max( ('a', 'b', 1) ) |
Error FORG0006 |
max( 2 ) |
2 |
max($ordDoc//item/@dept) |
Error, if dept is untyped |
max($ordDoc//item/string(@dept)) |
WMN |
See Also
| functx:max-determine-type | The maximum value in a sequence, figuring out its type (numeric or string) |
| functx:max-node | The XML node whose typed value is the maximum |
| functx:max-string | The maximum of a sequence of values, treating them like strings |
| fn:min | The minimum of a sequence of values |
History
| Published On | Last Updated | Contributor(s) |
|---|---|---|
| 2006-06-27 | 2007-02-26 | W3C, XQuery 1.0 and XPath 2.0 Functions and Operators, http://www.w3.org/TR/xpath-functions/ |
Recommended Reading:
