Update expression.
The following construct(s) refer to this construct:
An UpdateExpr contains either one of the basic update
operations that insert, delete, rename or replace node sequences. Or it is a
FLWUExpr which is a variant of the regular FLWR expressions for
more complex update operations. All update expressions are introduced by the
keyword update.
As a result the list of those XML objects is returned that were affected by the update operation.
For any update operation, you need appropriate writing permission for the
resulting document. The resulting document must still conform to the schema
definition except if you deliberately turn off schema validation for the
affected database. If you use more than one update operation in a
FLWUExpr this can lead to conflicts. See
Performing Update Operations
for details.
See the pages to the respective update expressions for examples.
