fn.head
fn.head( seq as Sequence ) as Item?
Summary
Returns the first item in a sequence. For more details, see XPath 3.0 Functions and Operators.
| Parameters | |
|---|---|
| seq |
A Sequence of items.
A single item is treated as a Sequence of one.
An Array is treated as a single item -- if an Array is passed in, the Array is returned.
To make a Sequence from an Array see xdmp.arrayValues.
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Example
fn.head(xdmp.arrayValues([1,2,3])) => 1