XPath problem

[Riki]

I'm stuck with an XPath query to produce a TreeView.

From the data below, I want to select all the score elements having an IdIn
of 2018, ***including their ancestors***.
With the result, I want to fill a TreeView control.

This is my simplified data:

<?xml version="1.0" encoding="utf-8"?>
<Punten>
<test Titel="TRAINING " >
<test Titel="web" >
<test Titel="Excel" >
<test Titel="Eindtest Excel" >
<score IdIn="1878" Score="12" />
<score IdIn="2011" Score="14" />
<score IdIn="2018" Score="15" />
</test>
</test>
<test Titel="VB" >
<test Titel="TEST1" >
<score IdIn="2127" Score="20" />
<score IdIn="2018" Score="17" />
<score IdIn="2037" Score="11" />
</test>
</test>
<test Titel="ASP" >
<test Titel="Examen" >
<score IdIn="1878" Score="28" />
<score IdIn="2011" Score="-998" />
<score IdIn="2018" Score="60" />
</test>
</test>
</test>
<test Titel="web2" >
<test Titel="Excel" >
<test Titel="Eindtest Excel" >
<score IdIn="2042" Score="13" />
<score IdIn="2091" Score="12" />
<score IdIn="1818" Score="13" />
</test>
</test>
<test Titel="Flash" Soort="Vak" >
<test Titel="flintsto nes" >
<score IdIn="2091" Score="6" />
<score IdIn="2087" Score="10" />
<score IdIn="2123" Score="5" />
</test>
</test>
</test>
</test>
</Punten>

This is the tree I want to produce (the scores with IdIn=2018):

<Punten>
<test Titel="TRAINING " >
<test Titel="web" >
<test Titel="Excel" >
<test Titel="Eindtest Excel" >
<score IdIn="2018" Score="15" />
</test>
</test>
<test Titel="VB" >
<test Titel="TEST1" >
<score IdIn="2018" Score="17" />
</test>
</test>
<test Titel="ASP" >
<test Titel="Examen" >
<score IdIn="2018" Score="60" />
</test>
</test>
</test>
</test>
</Punten>

I have tried this XPath value (with an XmlDataSource):
//score[@IdIn='3234']/ancestor-or-self::*

It should give me what I want, but it produces an error in
TreeView.DataBi ndRecursive:
Object reference not set to an instance of an object

The query
//test[not(@Verwijderd ='1')]/score[@IdIn='3234']
works without an error, but only produces the "scores" items

Does anybody know a working XPath query for this?

Any help with this problem is appreciated.

--

Riki

[Dimitre Novatchev]

Re: XPath problem

This is not an XPath problem -- you need to ask in an appropriate newsgroup
about the issue you are having with the TreeView control.

Cheers,
Dimitre Novatchev


"Riki" <riki@bounce.co mwrote in message
news:%234f7gP%2 3qGHA.4508@TK2M SFTNGP04.phx.gb l...

I'm stuck with an XPath query to produce a TreeView.
>
From the data below, I want to select all the score elements having an
IdIn of 2018, ***including their ancestors***.
With the result, I want to fill a TreeView control.
>
This is my simplified data:
>
<?xml version="1.0" encoding="utf-8"?>
<Punten>
<test Titel="TRAINING " >
<test Titel="web" >
<test Titel="Excel" >
<test Titel="Eindtest Excel" >
<score IdIn="1878" Score="12" />
<score IdIn="2011" Score="14" />
<score IdIn="2018" Score="15" />
</test>
</test>
<test Titel="VB" >
<test Titel="TEST1" >
<score IdIn="2127" Score="20" />
<score IdIn="2018" Score="17" />
<score IdIn="2037" Score="11" />
</test>
</test>
<test Titel="ASP" >
<test Titel="Examen" >
<score IdIn="1878" Score="28" />
<score IdIn="2011" Score="-998" />
<score IdIn="2018" Score="60" />
</test>
</test>
</test>
<test Titel="web2" >
<test Titel="Excel" >
<test Titel="Eindtest Excel" >
<score IdIn="2042" Score="13" />
<score IdIn="2091" Score="12" />
<score IdIn="1818" Score="13" />
</test>
</test>
<test Titel="Flash" Soort="Vak" >
<test Titel="flintsto nes" >
<score IdIn="2091" Score="6" />
<score IdIn="2087" Score="10" />
<score IdIn="2123" Score="5" />
</test>
</test>
</test>
</test>
</Punten>
>
This is the tree I want to produce (the scores with IdIn=2018):
>
<Punten>
<test Titel="TRAINING " >
<test Titel="web" >
<test Titel="Excel" >
<test Titel="Eindtest Excel" >
<score IdIn="2018" Score="15" />
</test>
</test>
<test Titel="VB" >
<test Titel="TEST1" >
<score IdIn="2018" Score="17" />
</test>
</test>
<test Titel="ASP" >
<test Titel="Examen" >
<score IdIn="2018" Score="60" />
</test>
</test>
</test>
</test>
</Punten>
>
I have tried this XPath value (with an XmlDataSource):
//score[@IdIn='3234']/ancestor-or-self::*
>
It should give me what I want, but it produces an error in
TreeView.DataBi ndRecursive:
Object reference not set to an instance of an object
>
The query
//test[not(@Verwijderd ='1')]/score[@IdIn='3234']
works without an error, but only produces the "scores" items
>
Does anybody know a working XPath query for this?
>
Any help with this problem is appreciated.
>
--
>
Riki
>

[dickster]

Re: XPath problem

Some one please correct me if I'm wrong - I may be !

http://www.w3.org/TR/xpath states:

The primary syntactic construct in XPath is the expression. An
expression matches the production Expr. An expression is evaluated to
yield an object, which has one of the following four basic types:

* node-set (an unordered collection of nodes without duplicates)
* boolean (true or false)
* number (a floating-point number)
* string (a sequence of UCS characters)

The resultant fully formed XML you wish to see returned cannot be
returned by an xpath expression.

Your XPath Expression applied to your XMLDocument will return you a
NodeList.

I reckon you need to explore XSLT to transform the original XML into
the desired result.

Dickster