Tamino XQuery User Guide - Software AG Documentation

Performing Update Operations
In Tamino XQuery you can perform the following elementary update operations on the node level:
inserting, deleting, replacing and renaming. All update operations follow the syntactic pattern
that they begin with the keyword update. You can either specify directly one of the update operations
using insert, delete, replace, rename or you can construct more complex expressions by
using a special form of the FLWOR expression that is only used for update operations. In general,
all update operations have to result in well-formed documents.
Inserting Nodes
For inserting nodes you have to specify two expressions. The first expression represents the node(s)
to be inserted and the second expression determines the update node, namely the position in all
matching documents at which the insert operation should take place. As a result, the documents
will contain the additional element or attribute nodes inserted at the update node. This is done
differently for element and attribute nodes.
Inserting Element Nodes
Consider the following query expression that extends our current bibliography:
update insert
XML Schema Part 0: Primer
Fallside
David C.
IBM
World Wide Web Consortium
0.00
into input()/bib
This query inserts the book element as last child element of each bib element. Using the keyword
into always tries to insert an element as the last child element of the update node. If the update
node has not yet any child elements, the elements to insert will then be its first child elements.
Apart from into there are two other keywords that you can use when inserting element nodes.
Using preceding the element nodes will be inserted as preceding siblings to the update node.
Using following the element nodes will be inserted as siblings following the update node.
38
XQuery User Guide