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() | ||
Details
Namespace: http://saxon.sf.net/
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 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){$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>.
Note: this function is quite different from the EXSLT leading() function, though both fulfil a similar purpose.
Notes on the Saxon implementation
Fully implemented. Changed in Saxon 9.5 to take a function rather than an expression as the second argument.