SelectNodes and namespace

[Ender]

I am having an issue trying to use the SelectNodes method in C# when
using an Xpath Query. I realize lots of people have posted on this
subject, but I have a little bit of a different variation.

Let's take the document

<MyNodes>
<MyNode Attrib1="Cat"/>
<MyNode Attrib1="Dog"/>
<MyNode OtherAttrib="Ho use"/>
<MyNodes/>

I want to be able to select from that document and get a list of
MyNode that has the Attrib1 attribute, but not those with OtherAttrib.

My Xpath query works fine if I do an absolute path, such as

/MyNodes/MyNode[@Attrib1]

However, if I try to use the relative version, such as
MyNodes/MyNode[@Attrib1]
then, the results are empty.

From reading in the groups, it seems that you need to provide a
NameSpace for the Xpath query to be valid.

My problem is I am using a XML document that is provided by another
party. They do not have a schema at all within the document.

What options do I have for getting a list of the nodes like I
identified above? Contacting the party about changing their XML
format isn't an options.

Thanks for any help

Endymion Keats

[Dare Obasanjo [MSFT]]

I'm not sure that your problem has anything to do with namespaces or
schemas. The problem is most likely due to the fact that you are performing
a relative query on the wrong node.

--
This posting is provided "AS IS" with no warranties, and confers no rights.

"Ender" <en*********@ho tmail.com> wrote in message
news:47******** *************** **@posting.goog le.com...

I am having an issue trying to use the SelectNodes method in C# when
using an Xpath Query. I realize lots of people have posted on this
subject, but I have a little bit of a different variation.

Let's take the document

<MyNodes>
<MyNode Attrib1="Cat"/>
<MyNode Attrib1="Dog"/>
<MyNode OtherAttrib="Ho use"/>
<MyNodes/>

I want to be able to select from that document and get a list of
MyNode that has the Attrib1 attribute, but not those with OtherAttrib.

My Xpath query works fine if I do an absolute path, such as

/MyNodes/MyNode[@Attrib1]

However, if I try to use the relative version, such as
MyNodes/MyNode[@Attrib1]
then, the results are empty.

From reading in the groups, it seems that you need to provide a
NameSpace for the Xpath query to be valid.

My problem is I am using a XML document that is provided by another
party. They do not have a schema at all within the document.

What options do I have for getting a list of the nodes like I
identified above? Contacting the party about changing their XML
format isn't an options.

Thanks for any help

Endymion Keats

[Ender]

My code looks like the following
--------

strXpathQuery = "MyNode[@Attrib1]";

// Get xml into Dom object
xmlDom= oCanvasNode.Xml ;

oQueryNodeList = xmlDom.Document Element.SelectN odes(strXpathQu ery );
if (oQueryNodeList .Count >0)
{
// Do something
}

--
As I understand it, if I don't use an absolute search, it should find
all nodes that meet the criteria, from the current node.
In this case all the MyNode nodes within the document.

If this is not the case, is there a way I can retrieve all nodes in a
document, independent of the node
they are on.

What I am trying to do is, at a high level, dynamically replace a set
of nodes with a value, where that value
is determined at run time. The nodes can be anywhere in the document.
XSLT is not an option.

Thanks
Endymion

[Oleg Tkachenko]

Ender wrote:

As I understand it, if I don't use an absolute search, it should find
all nodes that meet the criteria, from the current node.
In this case all the MyNode nodes within the document.
Nope, "MyNode[@Attrib1]" expression is shorthand for
"child::MyN ode[attribute::Attr ib1]" what in plain English is "MyNode
element, child of current node, which bears Attrib1 attribute".
If this is not the case, is there a way I can retrieve all nodes in a
document, independent of the node
they are on.

It's //MyNode[@Attrib1]
or better but longer
/descendant::MyN ode[@Attrib1]

Or as you call SelectNodes on DocumentElement , you can use
..//MyNode[@Attrib1]
or
descendant::MyN ode[@Attrib1]
Latter means "all MyNode elemens, descendants of current node, bearing
Attrib1 attribute".
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

[Ender]

Thanks!

That worked, I appreciate the help.

Endymion Keats