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namespace-uri-from-QName

The namespace-uri-from-QName function in XQuery returns the namespace URI part of a given QName value. This allows extracting the namespace URI component from an

xs:QName

Syntax

fn:namespace-uri-from-QName(arg)

The following table describes the argument for this command:

Argument	Required/Optional	Description
arg	Optional	The QName from which to extract the namespace URI. Returns empty sequence if $arg is empty or omitted.

Return Value

Returns the namespace URI for

$arg

as an

xs:string

Returns the

xs:anyURI

representing the namespace URI of the QName argument.

Returns the zero-length string is returned, if

$arg

is no namespace.

Returns an empty sequence if the input is empty or omitted.

Examples

The following table lists some sample values and return values:

SAMPLE FUNCTION	OUTPUT
fn:namespace-uri-from-QName(QName("", "bar"))	"" (empty string)
fn:namespace-uri-from-QName(())	()

Additional information

The input must be a valid QName.

This function complements

local-name-from-QName()

which returns the local part.

It can be used to determine namespace URIs dynamically when working with QName values.

XML Namespaces and Names

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Table of Contents

Design

Design

namespace-uri-from-QName

namespace-uri-from-QName

Syntax

Return Value

Examples

Additional information