Name
distinct — Removes double entities from the input sequence
Synopsis
sequence
distinct
(
|
input
sequence
); |
Description
The function takes a single parameter which is sequence of XML entities (nodes or values) and returns the sequence that results from removing from input sequence all but one of a set of elements that are identical each other. If input sequence is the empty, the empty sequence is returned.
Note that the distinct
is not a part of XPATH 1.0
or XQuery 1.0 standard library, it is rather a generalization of standard distinct-nodes
and
distinct-values
functions.
Parameters
input
The sequence of XML entities
Return Types
Sequence
Examples
Example 24.577. Removing double entities
In the following example the file example.xml is
<a> <b/> <b/> </a>
The result of the query
<result>
{
distinct(for $r in document("example.xml")//b return $r)
}
</result>
is only one 'b' element:
<result> <b/> </result>