Specify an element in a nodeset directly

[eric.goforth@gmail.com]

Hello,

Is there any way to directly access an element in a nodeset?

For example, if working with:

<blahs rec_count="16">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>

For instance, I could specify something like blahs/blah[2]/yada and get
the value of "123"?

-Eric

[Peter Flynn]

Re: Specify an element in a nodeset directly

eric.goforth@gm ail.com wrote:

Hello,
>
Is there any way to directly access an element in a nodeset?
>
For example, if working with:
>
<blahs rec_count="16">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>
>
For instance, I could specify something like blahs/blah[2]/yada and get
the value of "123"?

Yes, exactly that. In XSLT, for example, you would write

<xsl:value-of select="blahs/blah[2]/yada"/>

But this doesn't have anything to do with nodesets.
It's just an XPath statement referencing an element.

///Peter
--
XML FAQ: http://xml.silmaril.ie/

[eric.goforth@gmail.com]

Re: Specify an element in a nodeset directly


Peter Flynn wrote:

eric.goforth@gm ail.com wrote:

Hello,

Is there any way to directly access an element in a nodeset?

For example, if working with:

<blahs rec_count="16">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>

For instance, I could specify something like blahs/blah[2]/yada and get
the value of "123"?

>
Yes, exactly that. In XSLT, for example, you would write
>
<xsl:value-of select="blahs/blah[2]/yada"/>
>
But this doesn't have anything to do with nodesets.
It's just an XPath statement referencing an element.
>

Peter,

Hmmm, well the situation in a little more detail is that I'm passing in
this nodeset, I believe that's the right word, in a parameter.

So my entire XML document looks more like:

<mydoc>
<mystuff>
<blahs rec_count="3">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>
</mystuff>
</mydoc>

I'm passing the blahs to a template as a parameter like so:


<xsl:apply-templates select="somestu ff">
<xsl:with-param name="myblahs"
select="/mydoc/mystuff/blahs"></xsl:with-param>
</xsl:apply-templates>


Then in my template it looks something like:

<xsl:template match="somestuf f">

<xsl:param name="myblahs"/>

.... Do some stuff...

</xsl:template >

So debugging the transformation of the somestuff template in XML Spy,
if I look at $myblahs in the XPath-Watch, I see NodeSet[1]. If I click
on the NodeSet[1] beside the $myblahs in the XPath-Watch I see blahs
with a rec_count="3", so my data made it inside the somestuff template.

However, if I do a <xsl:value-of select="$myblah s/blah[2]/yada"/>

I get an Error: Invalid XPath.

Thanks,
Eric

[Dimitre Novatchev]

Re: Specify an element in a nodeset directly

However, if I do a <xsl:value-of select="$myblah s/blah[2]/yada"/>

Try:

$myblahs[2]/yada


Cheers,
Dimitre Novatchev

<eric.goforth@g mail.comwrote in message
news:1159822124 .780628.81270@b 28g2000cwb.goog legroups.com...

>
Peter Flynn wrote:

>eric.goforth@gm ail.com wrote:

Hello,
>
Is there any way to directly access an element in a nodeset?
>
For example, if working with:
>
<blahs rec_count="16">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>
>
For instance, I could specify something like blahs/blah[2]/yada and get
the value of "123"?

>>
>Yes, exactly that. In XSLT, for example, you would write
>>
><xsl:value-of select="blahs/blah[2]/yada"/>
>>
>But this doesn't have anything to do with nodesets.
>It's just an XPath statement referencing an element.
>>

>
Peter,
>
Hmmm, well the situation in a little more detail is that I'm passing in
this nodeset, I believe that's the right word, in a parameter.
>
So my entire XML document looks more like:
>
<mydoc>
<mystuff>
<blahs rec_count="3">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>
</mystuff>
</mydoc>
>
I'm passing the blahs to a template as a parameter like so:
>
>
<xsl:apply-templates select="somestu ff">
<xsl:with-param name="myblahs"
select="/mydoc/mystuff/blahs"></xsl:with-param>
</xsl:apply-templates>
>
>
Then in my template it looks something like:
>
<xsl:template match="somestuf f">
>
<xsl:param name="myblahs"/>
>
... Do some stuff...
>
</xsl:template >
>
So debugging the transformation of the somestuff template in XML Spy,
if I look at $myblahs in the XPath-Watch, I see NodeSet[1]. If I click
on the NodeSet[1] beside the $myblahs in the XPath-Watch I see blahs
with a rec_count="3", so my data made it inside the somestuff template.
>
However, if I do a <xsl:value-of select="$myblah s/blah[2]/yada"/>
>
I get an Error: Invalid XPath.
>
Thanks,
Eric
>

[eric.goforth@gmail.com]

Re: Specify an element in a nodeset directly


Dimitre Novatchev wrote:

However, if I do a <xsl:value-of select="$myblah s/blah[2]/yada"/>

>
Try:
>
$myblahs[2]/yada
>
>
Cheers,
Dimitre Novatchev
>
<eric.goforth@g mail.comwrote in message
news:1159822124 .780628.81270@b 28g2000cwb.goog legroups.com...

Peter Flynn wrote:

eric.goforth@gm ail.com wrote:
Hello,

Is there any way to directly access an element in a nodeset?

For example, if working with:

<blahs rec_count="16">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>

For instance, I could specify something like blahs/blah[2]/yada and get
the value of "123"?
>
Yes, exactly that. In XSLT, for example, you would write
>
<xsl:value-of select="blahs/blah[2]/yada"/>
>
But this doesn't have anything to do with nodesets.
It's just an XPath statement referencing an element.
>

Peter,

Hmmm, well the situation in a little more detail is that I'm passing in
this nodeset, I believe that's the right word, in a parameter.

So my entire XML document looks more like:

<mydoc>
<mystuff>
<blahs rec_count="3">
<blah>
<yada>abc</yada>
</blah>
<blah>
<yada>123</yada>
</blah>
<blah>
<yada>xyz</yada>
</blah>
</blahs>
</mystuff>
</mydoc>

I'm passing the blahs to a template as a parameter like so:


<xsl:apply-templates select="somestu ff">
<xsl:with-param name="myblahs"
select="/mydoc/mystuff/blahs"></xsl:with-param>
</xsl:apply-templates>


Then in my template it looks something like:

<xsl:template match="somestuf f">

<xsl:param name="myblahs"/>

... Do some stuff...

</xsl:template >

So debugging the transformation of the somestuff template in XML Spy,
if I look at $myblahs in the XPath-Watch, I see NodeSet[1]. If I click
on the NodeSet[1] beside the $myblahs in the XPath-Watch I see blahs
with a rec_count="3", so my data made it inside the somestuff template.

However, if I do a <xsl:value-of select="$myblah s/blah[2]/yada"/>

I get an Error: Invalid XPath.

Thanks,
Eric

I've figured out how to do get it to work. <xsl:value-of
select="$myblah s/blah[2]/yada"/is working for me now, I think that I
must have had a type in there.

The only problem I'm having now is figuring out how to make the "2"
variable.

For instance:

<xsl:value-of
select="$myblah s/blah[/xpath1/xpath2/someintegervalu e]/yada"/>

-Eric

[Martin Honnen]

Re: Specify an element in a nodeset directly



eric.goforth@gm ail.com wrote:

<xsl:value-of
select="$myblah s/blah[/xpath1/xpath2/someintegervalu e]/yada"/>

$myblahs/blah[/xpath1/xpath2/someintegervalu e = position()]/yada

--

Martin Honnen

http://JavaScript.FAQTs.com/

[eric.goforth@gmail.com]

Re: Specify an element in a nodeset directly


Martin Honnen wrote:

eric.goforth@gm ail.com wrote:
>
>

<xsl:value-of
select="$myblah s/blah[/xpath1/xpath2/someintegervalu e]/yada"/>

>
$myblahs/blah[/xpath1/xpath2/someintegervalu e = position()]/yada
>
--
>
Martin Honnen
http://JavaScript.FAQTs.com/

Martin,

Hmmm, that's not working for me. If I put in a "1" or a "2" it works,
but not with the "variable".

In my case

<xsl:apply-templates select="thingsu mmary">
<xsl:with-param name="furballs"
select="/xpath1/xpath2/furballssummary "></xsl:with-param>
</xsl:apply-templates>

</xsl:template>

<xsl:template match="thingsum mary">

<xsl:param name="furballs"/>

<xsl:apply-templates select="thing[(position() mod 2)=1]">
<xsl:with-param name="furballs"
select="$furbal ls"></xsl:with-param>
</xsl:apply-templates>

</xsl:template>

<xsl:template match="thing[(position() mod 2)=1]">

<xsl:param name="furballs"/>

<!-- This works-->
<xsl:value-of select="thingin tegerfield1"/>

<!-- This works-->
<xsl:value-of select="$furbal ls/furball[1]/furballmember"/>

<!-- This works-->
<xsl:value-of select="$furbal ls/furball[1=
position()]/furballmember"/>

<!-- This does not work-->
<xsl:value-of
select="$furbal ls/furball[1=thingintegerf ield1]/furballmember"/>

</xsl:template>

Thanks
Eric

[roy axenov]

Re: Specify an element in a nodeset directly


eric.goforth@gm ail.com wrote:

Martin Honnen wrote:

eric.goforth@gm ail.com wrote:

<xsl:value-of select="
$myblahs/blah[/xpath1/xpath2/someintegervalu e]/yada
"/>

$myblahs/blah
[/xpath1/xpath2/someintegervalu e=position()]/yada

>
Hmmm, that's not working for me. If I put in a "1" or a
"2" it works, but not with the "variable".

Your example is awfully vague. For better results, provide
a sample XML and a minimum XSLT demonstrating your problem.

<xsl:template match="thing[(position() mod 2)=1]">
<xsl:param name="furballs"/>
<!-- This works-->
<xsl:value-of select="thingin tegerfield1"/>
<!-- This does not work-->
<xsl:value-of select="
$furballs/furball[1=thingintegerf ield1]/furballmember
"/>
</xsl:template>

First of all, the [1=thingintegerf ield1] predicate should
be [position()=thin gintegerfield1] if I understood
correctly what you're trying to do (it's hard to be sure
without a working example).

Even then, I'd say you don't understand how contexts work.
Let's assume this template matched the node
/foo[1]/bar[1]/thing[1]. What does thingintegerfie ld1 in
the XPath marked as 'This works' refer to then? The answer
is '/foo[1]/bar[1]/thing[1]/thingintegerfie ld1'. And what
does thingintegerfie ld1 in the XPath marked as 'This does
not work' refer to? '$furballs/furball/thingintegerfie ld1'.
What you probably need is current()/thingintegerfie ld1,
although, once again, it's hard to be sure without a
working example.

To demonstrate:

XML:

<?xml version="1.0" encoding="UTF-8"?>
<foo>
<bar>
<xyzzy>
<int>3</int>
</xyzzy>
</bar>
<nodeset>
<node>
<str>wrong (1)</str>
<int>3</int>
</node>
<node>
<str>wrong (2)</str>
<int>2</int>
</node>
<node>
<str>right (3)</str>
<int>1</int>
</node>
</nodeset>
</foo>

XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:styleshe et
version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:apply-templates select="descend ant::xyzzy">
<xsl:with-param name="ns" select="/foo/nodeset"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="/foo/bar/xyzzy">
<xsl:param name="ns"/>
My Int: <xsl:value-of select="int"/>
Wrong: <xsl:value-of select="
$ns/node[int=position()]/str"/>
Right: <xsl:value-of select="
$ns/node[current()/int=position()]/str"/>
</xsl:template>
</xsl:stylesheet>

--
roy axenov

[eric.goforth@gmail.com]

Re: Specify an element in a nodeset directly


roy axenov wrote:

eric.goforth@gm ail.com wrote:

Martin Honnen wrote:

eric.goforth@gm ail.com wrote:
<xsl:value-of select="
$myblahs/blah[/xpath1/xpath2/someintegervalu e]/yada
"/>
>
$myblahs/blah
[/xpath1/xpath2/someintegervalu e=position()]/yada

Hmmm, that's not working for me. If I put in a "1" or a
"2" it works, but not with the "variable".

>
Your example is awfully vague. For better results, provide
a sample XML and a minimum XSLT demonstrating your problem.
>

Roy,

Here's an example of what I'm referring to. The "does not work"
comment shows what I'm trying to do. The "this does work" shows where
I'm able to hit the nodeset by hardcoding the parameter.

Thanks,
Eric

<page>
<contents>
<ratessummary rec_count="3">
<rate>
<ratecode>1</ratecode>
<myrate>1.1</myrate>
</rate>
<rate>
<ratecode>2</ratecode>
<myrate>1.2</myrate>
</rate>
<rate>
<ratecode>3</ratecode>
<myrate>1.3</myrate>
</rate>
</ratessummary>
<thingsummary rec_count="3">
<thing>
<short_descript ion>Jim</short_descripti on>
<description>Ja mes</description>
<thingcode>1</thingcode>
</thing>
<thing>
<short_descript ion>Rick</short_descripti on>
<description>Ri chard</description>
<thingcode>2</thingcode>
</thing>
<thing>
<short_descript ion>Fred</short_descripti on>
<description>Fr ederick</description>
<thingcode>3</thingcode>
</thing>
</thingsummary>
</contents>
</page>

<?xml version="1.0" encoding="UTF-8"?>
<xsl:styleshe et xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
version="2.0">
<xsl:template match="/">
<html>
<head></head>
<body>
<xsl:apply-templates select="page/contents"></xsl:apply-templates>
</body>
</html>
</xsl:template>
<xsl:template match="contents ">
<table>
<tr>
<td class="data">
<xsl:apply-templates select="thingsu mmary">
<xsl:with-param name="rates"
select="/page/contents/ratessummary"></xsl:with-param>
</xsl:apply-templates>
</td>
</tr>
</table>
</xsl:template>

<xsl:template match="thingsum mary">

<xsl:param name="rates"/>

<xsl:value-of select="$rates/rate[1]/org_id"/>

<table>
<xsl:apply-templates select="thing[(position() mod 2)=1]">
<xsl:with-param name="rates" select="$rates" ></xsl:with-param>
</xsl:apply-templates>
</table>
</xsl:template>

<xsl:template match="thing[(position() mod 2)=1]">
<xsl:param name="rates"/>
<tr>
<td>
<xsl:value-of select="short_d escription"/>-<xsl:value-of
select="thingco de"/>-<xsl:value-of select="$rates/rate[1]/org_id"/>
<!-- This does not work-->
test1<xsl:value-of select="$rates/rate[position()=thin gcode
]/myrate"/>
<!-- This works-->
test2<xsl:value-of select="$rates/rate[position()=1]/myrate"/>
</td>
<xsl:apply-templates select="followi ng-sibling::thing[1]">
<xsl:with-param name="rates" select="$rates" ></xsl:with-param>
</xsl:apply-templates>
</tr>
</xsl:template>
<xsl:template match="thing[(position() mod 2)=0]">
<xsl:param name="rates"/>
<td>
<xsl:value-of select="short_d escription"/>-<xsl:value-of
select="thingco de"/><xsl:value-of select="$rates/rate[1]/org_id"/>
<!-- This does not work-->
test1<xsl:value-of select="$rates/rate[position()=thin gcode
]/myrate"/>
<!-- This works-->
test2<xsl:value-of select="$rates/rate[1]/myrate"/>
</td>
</xsl:template>

</xsl:stylesheet>

[roy axenov]

Re: Specify an element in a nodeset directly


eric.goforth@gm ail.com wrote:

roy axenov wrote:

eric.goforth@gm ail.com wrote:

Martin Honnen wrote:
eric.goforth@gm ail.com wrote:
<xsl:value-of select="
$myblahs/blah
[/xpath1/xpath2/someintegervalu e]/yada
"/>

$myblahs/blah
[/xpath1/xpath2/someintegervalu e=position()]/yada
>
Hmmm, that's not working for me. If I put in a "1" or
a "2" it works, but not with the "variable".

Your example is awfully vague. For better results,
provide a sample XML and a minimum XSLT demonstrating
your problem.

>
Here's an example of what I'm referring to. The "does
not work" comment shows what I'm trying to do. The "this
does work" shows where I'm able to hit the nodeset by
hardcoding the parameter.

You should've read the rest of my post. Your example
confirms that my initial guess was right on money. I ran a
quick test, and the solution I proposed works, too.

<page>
<contents>
<ratessummary rec_count="3">
<rate>
<ratecode>1</ratecode>
<myrate>1.1</myrate>
</rate>
<rate>
<ratecode>2</ratecode>
<myrate>1.2</myrate>
</rate>
<rate>
<ratecode>3</ratecode>
<myrate>1.3</myrate>
</rate>
</ratessummary>
<thingsummary rec_count="3">
<thing>
<short_descript ion>Jim</short_descripti on>
<description>Ja mes</description>
<thingcode>1</thingcode>
</thing>
<thing>
<short_descript ion>Rick</short_descripti on>
<description>Ri chard</description>
<thingcode>2</thingcode>
</thing>
<thing>
<short_descript ion>Fred</short_descripti on>
<description>Fr ederick</description>
<thingcode>3</thingcode>
</thing>
</thingsummary>
</contents>
</page>

[XSLT]

<xsl:apply-templates select="thingsu mmary">
<xsl:with-param name="rates"
select="/page/contents/ratessummary"></xsl:with-param>
</xsl:apply-templates>

.. . .

<!-- This does not work-->
test1<xsl:value-of
select="$rates/rate[position()=thin gcode]/myrate"/>

So what does it do?

$rates/rate selects a nodeset of <ratenodes. The
predicate [position()=thin gcode] filters this nodeset,
dropping all the nodes that don't have a <thingcodechi ld
with content that is equal to the position of the <rate>
node in the $rates/rate nodeset. Since there are no <rate>
nodes with <thingcodechild ren in your document, the
resulting nodeset is, naturally, empty. I already explained
the solution in my previous reply.

--
roy axenov

[eric.goforth@gmail.com]

Re: Specify an element in a nodeset directly


roy axenov wrote:

So what does it do?
>
$rates/rate selects a nodeset of <ratenodes. The
predicate [position()=thin gcode] filters this nodeset,
dropping all the nodes that don't have a <thingcodechi ld
with content that is equal to the position of the <rate>
node in the $rates/rate nodeset. Since there are no <rate>
nodes with <thingcodechild ren in your document, the
resulting nodeset is, naturally, empty. I already explained
the solution in my previous reply.
>
--
roy axenov

Roy,

I played around with your example, but it doesn't seem to work when I
have multiple xyzzy elements, for example:

<foo>
<bar>
<xyzzy>
<int>3</int>
</xyzzy>
<xyzzy>
<int>4</int>
</xyzzy>
<xyzzy>
<int>5</int>
</xyzzy>
</bar>
<nodeset>
<node>
<str>wrong (1)</str>
<int>3</int>
</node>
<node>
<str>wrong (2)</str>
<int>2</int>
</node>
<node>
<str>right (3)</str>
<int>1</int>
</node>
</nodeset>
</foo>

I'm wondering if it's not possible to do what I'm trying to do.

-Eric

[Joe Kesselman]

Re: Specify an element in a nodeset directly

It really doesn't help us help you when you keep switching element
names, so we can't easily run your new example against your previous
description of the problem. Either pick one set and stick with it, or
post the matched set of sample and failing stylesheet code.

[Joe Kesselman]

Re: Specify an element in a nodeset directly

Your problem is that
$rates/rate[position()=thin gcode]/myrate
is looking for a thingcode child of rate -- but of course the thingcode
is child of thing. You're crossing contexts.

The easy way around this is a variable:

<td>
<xsl:value-of select="short_d escription"/>-<xsl:value-of
select="thingco de"/>-<xsl:value-of select="$rates/rate[1]/org_id"/>
<!-- This does not work because rate has no thingcode-->
test1<xsl:value-of
select="$rates/rate[position()=thin gcode]/myrate"/>
<!-- This works-->
test2<xsl:value-of select="$rates/rate[position()=1]/myrate"/>
<!-- This works because we're asking for thingcode in the right
context-->
<xsl:variable name="code" select="thingco de"/>
test3<xsl:value-of select="$rates/rate[position()=$cod e]/myrate"/>
</td>



--
() ASCII Ribbon Campaign | Joe Kesselman
/\ Stamp out HTML e-mail! | System architexture and kinetic poetry

[Joe Kesselman]

Re: Specify an element in a nodeset directly

Joe Kesselman wrote:

The easy way around this is a variable:

The other way around it would be to say

test3<xsl:value-of
select="$rates/rate[position()=curr ent()/thingcode]/myrate"/>

which says explicitly that you want the thingcode child of the current
XSLT context node (the thing) rather than the context at this point in
the XPath.

The good thing about computers is that they do what you tell them to.
The bad thing about computers is that they do what you tell them to.

--
() ASCII Ribbon Campaign | Joe Kesselman
/\ Stamp out HTML e-mail! | System architexture and kinetic poetry

[roy axenov]

Re: Specify an element in a nodeset directly


eric.goforth@gm ail.com wrote:

roy axenov wrote:

So what does it do?

$rates/rate selects a nodeset of <ratenodes. The
predicate [position()=thin gcode] filters this nodeset,
dropping all the nodes that don't have a <thingcode>
child with content that is equal to the position of the
<ratenode in the $rates/rate nodeset. Since there are
no <ratenodes with <thingcodechild ren in your
document, the resulting nodeset is, naturally, empty. I
already explained the solution in my previous reply.

>
I played around with your example, but it doesn't seem to
work when I have multiple xyzzy elements, for example:
>
<foo>
<bar>
<xyzzy>
<int>3</int>
</xyzzy>
<xyzzy>
<int>4</int>
</xyzzy>
<xyzzy>
<int>5</int>
</xyzzy>
</bar>
<nodeset>
<node>
<str>wrong (1)</str>
<int>3</int>
</node>
<node>
<str>wrong (2)</str>
<int>2</int>
</node>
<node>
<str>right (3)</str>
<int>1</int>
</node>
</nodeset>
</foo>

It *is* working. I'm not sure what the hell you were trying
to do with the input file like this, though.

Pray tell me, what did you expect as a result? It is
supposed to look up the nth <nodein the document for each
<xyzzy>, where n is the value of an <intchild of <xyzzy>
in question. Since there are only *three* <node>s in the
document, naturally, <xyzzy>'s with <intof 4 and 5 don't
return bloody anything.

I'm wondering if it's not possible to do what I'm trying
to do.

It's been explained no less than three times in this thread
that what you're trying to do is possible, that your
problem lies in messed-up contexts, that to get the context
of the current node you need to use the current() XPath
function. If you're still unable to grasp that, I recommend
hiring yourself an XSLT expert. Seriously, that'll save you
an awful lot of trouble, time and money.

--
roy axenov