XPath

[Neil]

I'm trying to get a list of nodes using the XMLNodeList.Sel ectNodes( xpath ) method. I want a list of criteria nodes where the attribute notModifiable is false or doesn't exist. Anyone know how to do this? So far I can grab the nodes with notModifiable equal false but I don't know how to do the second bit. My statement is like below

XmlNodeList criteriaNodeLis t = groupNode.Selec tNodes("criteri a[attribute::notm odifiable != \"true\"]");

I need to append something to this XPath statement to get the nodes which do not contain the attribute notModifiable

[Martin Honnen]

Re: XPath



Neil wrote:
[color=blue]
> I'm trying to get a list of nodes using the XMLNodeList.Sel ectNodes(
> xpath ) method. I want a list of criteria nodes where the attribute
> notModifiable is false or doesn't exist. Anyone know how to do this?
> So far I can grab the nodes with notModifiable equal false but I
> don't know how to do the second bit. My statement is like below.
>
> XmlNodeList criteriaNodeLis t =
> groupNode.Selec tNodes("criteri a[attribute::notm odifiable !=
> \"true\"]");
>
> I need to append something to this XPath statement to get the nodes
> which do not contain the attribute notModifiable[/color]

With the example document being

<?xml version="1.0" encoding="UTF-8"?>
<root>
<criteria notModifiable=" true" />
<criteria notModifiable=" false" />
<criteria />
</root>

you need
criteria[not(@notModifia ble) or @notModifiable = 'false']

the following sample C# program extracts those

using System;
using System.Xml;

public class Test20040408 {
public static void Main (string[] args) {
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Loa d(@"test2004040 8.xml");
XmlNodeList criterias = xmlDocument.Sel ectNodes(
"//criteria[not(@notModifia ble) or @notModifiable = 'false']");
foreach (XmlNode criteria in criterias) {
Console.WriteLi ne(criteria.Out erXml);
}
}
}
--

Martin Honnen

http://JavaScript.FAQTs.com/

[Daniel Cazzulino [MVP XML]]

Re: XPath

XPath spec. says empty node lists (i.e. a node that does not exist for the
test) are converted to false. So you only need the following:

XmlNodeList criteriaNodeLis t =
groupNode.Selec tNodes("criteri a[not(attribute:: notmodifiable)]");

the not() function implicitly converts its parameter to a boolean.
Therefore, if the attribute exists, its value is converted to a boolean. If
it doesn't, it's converted to false.

--
Daniel Cazzulino [MVP XML]
Clarius Consulting SA

http://weblogs.asp.net/cazzu

http://aspnet2.com

"Neil" <ndglover@urban science.com> wrote in message
news:5E1753E7-2AC0-41A3-85AD-599A0139D441@mi crosoft.com...[color=blue]
> I'm trying to get a list of nodes using the XMLNodeList.Sel ectNodes([/color]
xpath ) method. I want a list of criteria nodes where the attribute
notModifiable is false or doesn't exist. Anyone know how to do this? So far
I can grab the nodes with notModifiable equal false but I don't know how to
do the second bit. My statement is like below.[color=blue]
>
> XmlNodeList criteriaNodeLis t =[/color]
groupNode.Selec tNodes("criteri a[attribute::notm odifiable != \"true\"]");[color=blue]
>
> I need to append something to this XPath statement to get the nodes which[/color]
do not contain the attribute notModifiable


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