saxon:leading
Returns the items in a sequence up to a selected item.
leading($input as item()*) ➔ item()
Arguments | |||
| $input | item()* | The input sequence |
Result | item() | ||
leading($input as item()*, $test as function(*)) ➔ item()
Arguments | |||
| $input | item()* | The input sequence |
| $test | function(*) | Function determining where the sequence should terminate |
Result | item() | ||
Namespace
http://saxon.sf.net/
Notes on the Saxon implementation
Available since before Saxon 8.0. Changed in Saxon 9.5 to take a function rather than an expression as the second argument.
Details
This function returns a sequence containing all those nodes from $input up
to and excluding the first one (in order of the input sequence) for which
$test has an effective boolean value of false.
The $test argument defaults to the function fn:data#1, that
is, it atomizes the item.
The $test function is evaluated for each item in $input in
turn, with that item supplied as the argument to the function. The result consists of
that leading sequence of items for which the effective boolean value of the function is
true.
For example:
saxon:leading(following-sibling::*, function($x){exists($x/self::para}))where the supplied function tests whether the supplied item is a
<para> element.
This will return the <para> elements following the current node,
stopping at the first element that is not a <para>.