Inserting and removing data with QXmlQuery

piemur2000

Hello,

I would like to know if it is possible to insert/modify/remove data with an XQuery using QXmlQuery?

I found an "exemple":http://www.xmlmind.com/tutorials/XQueryUpdate/index.html of XQuery updating some data with the following query but I am not able to run it:
@for $idattr in doc("data.xml")//ITEM/@Id (: selection :)
return (
delete node $idattr, (: update 1 :)
insert node <NID>{string($idattr)}</NID> (: update 2 :)
as first into $idattr/..
)@
I have the following error :
syntax error, unexpected node, expecting )

If it is not possible to use insert or delete how I am suppose to modify the content of a document?

Thanks

AshkanV

Hello
I had the same problem. It is looks like that Qt currently only supports "Minimal Conformance" and yet does not support optional XQuery features as it is described here:

QXMLQuery Features and Conformance:

XQuery 1.0

Qt XML Patterns aims at being a conformant XQuery processor. It adheres to Minimal Conformance and supports the Serialization Feature and the Full Axis Feature. Qt XML Patterns currently passes 97% of the tests in the XML Query Test Suite. Areas where conformance may be questionable and where behavior may be changed in future releases include:

Some corner cases involving namespaces and element constructors are incorrect.
XPath is a subset of XQuery and the implementation of Qt XML Patterns uses XPath 2.0 with XQuery 1.0.

The specifications discusses conformance further: XQuery 1.0: An XML Query Language. W3C's XQuery testing effort can be of interest as well, XML Query Test Suite.

Currently fn:collection() does not access any data set, and there is no API for providing data through the collection. As a result, evaluating fn:collection() returns the empty sequence. We intend to provide functionality for this in a future release of Qt.

Only queries encoded in UTF-8 are supported.

And here is the relation of XQuery update with "Minimal Conformance"

So I guess this feature is not included in the current version of QXMLQuery

Instead it is possible to use QDomDocument.