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Rob Cooke · Guest

Running Delphi 2007 for Win32

I just discovered the IDOMNodeSelect interface in the xmldom unit. I've been wanting forever to use XPath queries
against IXMLDocument objects without using MSXML directly, and now it looks like I can. I'm having trouble getting it
to work when the xml document contains namespaces. A fragment of my doc:

<?xml version="1.0"?>
<bml:BatchInformation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:bml="http://www.wbf.org/xml/BatchML-V02" xsi:schemaLocation="http://www.wbf.org/xml/BatchML-V02
file:///c:/Projects/BatchML/BatchML-V02.xsd">
<bml:RecipeBuildingBlock>
<bml:Description>Inline Dilution</bml:Description>
<bml:RecipeElement>
<bml:ID>5002</bml:ID>
<bml:RecipeElementType>Phase</bml:RecipeElementType>
</bml:RecipeElement>
</bml:RecipeBuildingBlock>
</bml:BatchInformation)

When I tried the following function:

procedure TForm1.GetPhases;
var
doc: IXmlDocument;
sel: IDOMNodeSelect;
nl: IDOMNodeList;
begin
doc := LoadXmlDocument(ExtractFilePath(Application.ExeName) + 'RecipeBuildingBlocks.xml');
doc.DocumentElement.DeclareNamespace('bml', 'http://www.wbf.org/xml/BatchML-V02');
sel := doc.DOMDocument as IDOMNodeSelect;
nl := sel.selectNodes('//bml:RecipeBuildingBlock');
ShowMessage(IntToStr(nl.length));
end;

I get the runtime error message "Reference to undeclared namespace prefix: 'bml'"

It seems that dom.DocumentElement is not the place to declare the namespace prefix, but I can't find anywhere else to do
it.

This code works fine for documents in which namespaces are not used. Any suggestions, please?

Thanks, Rob Cooke

Rob Cooke · Guest

On Sat, 05 May 2007 10:25:10 -0400, Rob Cooke <rob (AT) rjcooke (DOT) com> wrote: