MarkLogic 12 EA 1 Product Documentationcts:not-query
cts:not-query( $query as cts:query ) as cts:not-query
Summary
Returns a query specifying the matches not specified by its sub-query.
| Parameters | |
|---|---|
| query | A negative query, specifying the search results to filter out. |
Usage Notes
Thects:not-query constructor is fragment-based, so
it returns true only if the specified query does not produce a match
anywhere in a fragment. Therefore, a search using
cts:not-query is only guaranteed to be accurate if the underlying
query that is being negated is accurate from its index resolution (that is,
if the unfiltered results of the $query parameter to
cts:not-query are accurate). The accuracy of the index
resolution depends on the many factors such as the query, if you search
at a fragment root (that is, if the first parameter of
cts:search specifies an XPath that resolves to a fragment root),
the index options enabled on the database, the search options,
and other factors.
In cases where the $query parameter has false-positive matches,
the negation of the query can miss matches (have false negative matches).
In these cases,
searches with cts:not-query can miss results, even if those
searches are filtered.
Example
cts:search(//PLAY,
cts:not-query(
cts:word-query("summer")))
=> ... sequence of 'PLAY' elements not containing
any text node with the word 'summer'.
Example
let $doc :=
<doc>
<p n="1">Dogs, cats, and pigs</p>
<p n="2">Trees, frogs, and cats</p>
<p n="3">Dogs, alligators, and wolves</p>
</doc>
return
$doc//p[cts:contains(., cts:not-query("cat"))]
(: Returns the third p element (the one without
a "cat" term). Note that the
cts:contains forces the constraint to happen
in the filtering stage of the query. :)