mvp-xml-help

[mvp-xml-help] IndexingXPathNavigator and namespaces

[Rich N. <rne...@ae...>]

Hello:

 

I would really like to use the Mvp.Xml for a project I am on, but am having
some difficulty.  I have gotten the examples off of MSDN to work, but can't
seem to get it to work with the types of XML files I am dealing with.  The
XML have various namespaces and prefixes for elements and attributes.  The
problem occurs when I call the ".BuildIndexes()" method.  Here's the code
fragment:

 

        public static void SelectFromIndexingXPathNavigator(XPathNavigator
nav)

        {

            XmlNamespaceManager xmln = GetNamespaceMgr(nav.NameTable);

 

            IndexingXPathNavigator inav = new IndexingXPathNavigator(nav);

 

            //inav.AddKey("orderKey", "orders", "@OrderID");

            inav.AddKey("aptKey", @"//aixm:AirportHeliport/gml:identifier",
"gml:identifier");

 

 

            string test = "key('aptKey', '2443')";

 

            inav.BuildIndexes(); //   <-------Error here

            XPathNodeIterator order = inav.Select(test);

 

            //Check if the order was selected

            if (!order.MoveNext())

                throw new InvalidOperationException("Airport not found.");

 

        }

 

 I get an error as follows:

 

"Namespace Manager or XsltContext needed. This query has a prefix, variable,
or user-defined function."

 

 

I don't see a way to get the Namespace Manager into the
IndexingXPathNavigator class for the BuildIndexes() method? 

 

Thanks.

 

 

 

 

 

Rich Neidballa

Senior Developer

AeroNavData, Inc.

1839 Ghent Road Suite 230

Columbia, IL 62236 USA

Phone: 618-281-8986

Fax:  618-281-8558

rne...@ae...

www.aeronavdata.com

 

Re: [mvp-xml-help] IndexingXPathNavigator and namespaces

[Oleg T. <ol...@tk...>]

Well, it's a shame, but looks like it's not supported. We need to modify 
AddKey() to allow compiled XPath expressions too.

As a workaround you could use prefix-free expressions:
inav.AddKey("aptKey", @"*[local-name='AirportHeliport' and 
namespace-uri='aixm namespace']/*[local-name='identifier' and 
namespace-uri='gml namespace']", ".");

--
Oleg

Rich Neidballa wrote:
>
> Hello:
>
> I would really like to use the Mvp.Xml for a project I am on, but am 
> having some difficulty. I have gotten the examples off of MSDN to 
> work, but can’t seem to get it to work with the types of XML files I 
> am dealing with. The XML have various namespaces and prefixes for 
> elements and attributes. The problem occurs when I call the 
> “.BuildIndexes()” method. Here’s the code fragment:
>
> public static void SelectFromIndexingXPathNavigator(XPathNavigator nav)
>
> {
>
> XmlNamespaceManager xmln = GetNamespaceMgr(nav.NameTable);
>
> IndexingXPathNavigator inav = new IndexingXPathNavigator(nav);
>
> //inav.AddKey("orderKey", "orders", "@OrderID");
>
> inav.AddKey("aptKey", @"//aixm:AirportHeliport/gml:identifier", 
> "gml:identifier");
>
> string test = "key('aptKey', '2443')";
>
> inav.BuildIndexes(); // ß-----Error here
>
> XPathNodeIterator order = inav.Select(test);
>
> //Check if the order was selected
>
> if (!order.MoveNext())
>
> throw new InvalidOperationException("Airport not found.");
>
> }
>
> I get an error as follows:
>
> “Namespace Manager or XsltContext needed. This query has a prefix, 
> variable, or user-defined function.”
>
> I don’t see a way to get the Namespace Manager into the 
> IndexingXPathNavigator class for the BuildIndexes() method?
>
> Thanks.
>
> *Rich Neidballa*
>
> */Senior Developer/*
>
> */AeroNavData, Inc./*
>
> 1839 Ghent Road Suite 230
>
> Columbia, IL 62236 USA
>
> Phone: 618-281-8986
>
> Fax: 618-281-8558
>
> rne...@ae...
>
> www.aeronavdata.com
>
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