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FunctX XSLT Functions

fn:max

The maximum of a sequence of values

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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

NameTypeDescription
$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('http://www.functx.com/input/order.xml')"/>
XPath ExampleResults
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-typeThe maximum value in a sequence, figuring out its type (numeric or string)
functx:max-nodeThe XML node whose typed value is the maximum
functx:max-stringThe maximum of a sequence of values, treating them like strings
fn:minThe minimum of a sequence of values

History

Published OnLast UpdatedContributor(s)
2006-06-272007-02-26W3C, XQuery 1.0 and XPath 2.0 Functions and Operators, http://www.w3.org/TR/xpath-functions/
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Recommended Reading:

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