Trouble with XPath query

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tschulken - 15 Mar 2007 20:14 GMT

I have a query where i need to look for a value of a lower level xml
element based on the value of a parent element existing first. Here is
a simple example of the xml

<S3Client>
<Buttons>
<Button>Activity
<RestrictedClientType>
<ClientType>02</ClientType>
</RestrictedClientType>
</Button>
...
</Buttons>
</S3Client>

Here is my query, I am trying see if ClientType '02' exists when the
Button element has a value of "Activity". I wanted to do this in one
xpath query. Any help would be appreciated.
/Security/S3Client/Buttons[Button='Activity']/
RestrictedClientType[ClientType='02']

Tim

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Bjoern Hoehrmann - 15 Mar 2007 22:21 GMT

* tschulken wrote in microsoft.public.dotnet.xml:

>I have a query where i need to look for a value of a lower level xml
>element based on the value of a parent element existing first. Here is
[quoted text clipped - 16 lines]
>/Security/S3Client/Buttons[Button='Activity']/
>RestrictedClientType[ClientType='02']

For example:

//ClientType[ . = '02' and
ancestor::Button[ normalize-space() = 'Activity' ]

or

/S3Client/Buttons/Button[ normalize-space() = 'Activity' ]/
RestrictedClientType/ClientType[ . = '02' ]

Your expression is basically correct, but you missed the space
characters in the <Button> element.

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Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
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tschulken - 16 Mar 2007 01:26 GMT

> * tschulken wrote in microsoft.public.dotnet.xml:
>
[quoted text clipped - 37 lines]
>
> - Show quoted text -

Bjorn,

That makes sense but it seems that I am having trouble getting it to
work. Since the <RestrictedClientType> was added as a child node of
Button, seems that the first part of my query doesn't work. I guess I
am used to parent nodes just having no values or maybe just attributes
but seems that since Button has a value of "Activity" and then the
child node, does querying for the Activity Text change? Here is an
example, before <RestrictedClientType> was added, this xpath query
would work fine:
_xmlDocument.SelectSingleNode( "/Security/S3Client/Buttons/
Button['Activity']" );

Now that query does not work, any ideas?

Thanks.

Tim

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Bjoern Hoehrmann - 16 Mar 2007 02:30 GMT

* tschulken wrote in microsoft.public.dotnet.xml:

>> ><S3Client>
>> > <Buttons>
[quoted text clipped - 6 lines]
>> > </Buttons>
>> ></S3Client>

Here the content of the <Button> element is this:

1. the word "Activity" followed by
a line feed character followed by space characters
2. the RestrictedClientType element
3. a line feed character followed by space characters

I do not know whether the code above has been pretty printed for
readability, or whether it reflects what is actually in the tree
in memory, but assuming this is how it is in memory your original
... Button='Activity' ... would not work as that would match if
the content was just 'Activity'.

>That makes sense but it seems that I am having trouble getting it to
>work. Since the <RestrictedClientType> was added as a child node of
[quoted text clipped - 6 lines]
>_xmlDocument.SelectSingleNode( "/Security/S3Client/Buttons/
>Button['Activity']" );

I am not sure whether this is a typo, but this does not do what you
want at all. The string literal 'Activity' is converted to a boolean
(true) so this would select the first 'Button' element that has the
ancestors Buttons, S3Client, Security, in that order. You could also
write

/Security/S3Client/Buttons/Button['HelloWorld']

and the result would be the same.

>Now that query does not work, any ideas?

I do not see a reason why this would happen.

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tschulken - 16 Mar 2007 13:40 GMT

> * tschulken wrote in microsoft.public.dotnet.xml:
>
[quoted text clipped - 50 lines]
> Weinh. Str. 22 · Telefon: +49(0)621/4309674 ·http://www.bjoernsworld.de
> 68309 Mannheim · PGP Pub. KeyID: 0xA4357E78 ·http://www.websitedev.de/

Bjorn,

Yes, what i had was a typo and I apologize. The xpath query should be
"/Security/S3Client/Buttons[Button='Activity']". This used to work for
all Button lookups and now that I added the Child Node for the
"Activity" button, it doesn't work on that one (but still works for
others since they don't have children). Is there a way for a single
query to be used for both scenarios?

Tim

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tschulken - 16 Mar 2007 19:03 GMT

> > * tschulken wrote in microsoft.public.dotnet.xml:
>
[quoted text clipped - 63 lines]
>
> - Show quoted text -

Seems that having the child nodes alters the text for the Button so in
the case of the 'Activity' Button, its text is Activity02. Can I just
specify that I don't want to consider the child nodes text at this
point?

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Trouble with XPath query

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