MarkLogic 12 EA 2 Product Documentationfn:prefix-from-QName
fn:prefix-from-QName( $arg as xs:QName? ) as xs:NCName?
Summary
Returns an xs:NCName representing the prefix of $arg.
The empty sequence is returned if $arg is the empty sequence or
if the value of $arg contains no prefix.
| Parameters | |
|---|---|
| arg | A qualified name. |
Example
xquery version "1.0-ml";
declare namespace ex="http://www.example.com/example";
fn:prefix-from-QName(
fn:QName("http://www.example.com/example", "person") )
=> empty sequence, because the QName constructed
by fn:QName does not have a prefix
Example
let $qn := fn:QName("http://www.w3.org/XML/1998/namespace", "lang")
return
fn:prefix-from-QName(fn:node-name( attribute {$qn} {"en"}))
=> xml
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