Cezar,
I rewrote the expression - as you suggested - and tried:
XmlOptions xmlOpt = new XmlOptions();
xmlOpt.setXqueryCurrentNodeVar("self");
xo.selectPath("declare variable $self external; //[EMAIL PROTECTED]//@idRef]",
xmlOpt);
This approach resulted in the following exception:
java.lang.RuntimeException: net.sf.saxon.xpath.StaticError: XPath syntax
error at char 1 in { declare variable $}:
Unexpected token "declare variable" in path expression
Did I something wrong or is "declare variable .." only possible for
xo.execQuery ...?
Thanks for your help and Cheers
Siggi
--------------------------------------------------
Dipl.-Math. (Univ.)
Siegfried Baiz
Sulzer GmbH
Frankfurter Ring 162, D-80807 Muenchen
Tel.: +49 89 31858-264
Fax : +49 89 31858-599
mailto:[EMAIL PROTECTED]
--------------------------------------------------
Cezar Andrei wrote:
Hi Siegfried,
I'm not an expert in xpath/xquery but I'm pretty sure that $this doesn't
represent the internal current node that is processed by the engine.
So you'll probably want to rewrite the expression to something like
this:
xo.selectPath(".//[EMAIL PROTECTED]//@id]");
As for $this, it's just a variable that is bound to the XmlObject that
you are calling the selectPath method from. The '$this' construction is
not in the latest XPath/Xquery spec so it was deprecated, instead "."
should be used.
The current XmlObject can be bound to any user specified variable name
as in the following example:
XmlOptions options = new XmlOptions();
options.setXqueryCurrentNodeVar("myVariable");
XmlObject[] res = xo.selectPath("declare variable $myVariable
external; $myVariable//el1", options);
Which is equivalent to:
XmlObject[] res = xo.selectPath(".//el1", options);
And to the following (since in the context of the xpath engine the xo is
considered the root):
XmlObject[] res = xo.selectPath("//el1", options);
Since we don't control Saxon, we can't promise that expressions
confirming to the spec will work. We can only work on making sure we
make the right calls into Saxon.
Cezar
-----Original Message-----
From: Siegfried Baiz [mailto:[EMAIL PROTECTED]
Sent: Tuesday, March 14, 2006 12:11 PM
To: [email protected]
Subject: selectPath with FilterExpression using $this
Hello,
for a given XmlObject xo with an ID-Attribute 'id',
I've tried to launch the following xpath-expression:
xo.selectPath("//[EMAIL PROTECTED]/@id]")
in order to get all nodes (with idRef-Attribute) refering to my node
xo.
Unfortunatlly this expression seems not to work. I always get an
java.lang.ArrayIndexOutOfBoundsException from the underlying
net.sf.saxon.expr.XPathContextMajor.setLocalVariable(XPathContextMajor.j
av
a:213)
At
http://xmlbeans.apache.org/docs/2.0.0/guide/conSelectingXMLwithXQueryPat
hX
Path.html
I found the following notice:
"Notice in the query expression that the variable $this
represents
the current context node (the XmlObject that you are querying
from).
In this example you are querying from the document level
XmlObject."
After reading that sentence I've been thinking, that $this is somehow
similar to "curent()" in XSLT, but maybe a got the meaning wrong.
Does anyone know whats the problem here rsp.
is there a better way to accomplish the same thing?
Thanks a lot,
Siggi
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