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POHow do I use XPath with a default namespace with no prefix?
 

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  1. POHow do I use XPath with a default namespace with no prefix?
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    <p>What is the XPath (in C# API to XDocument.XPathSelectElements(xpath, nsman) if it matters) to query all MyNodes from this document?</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;configuration&gt; &lt;MyNode xmlns="lcmp" attr="true"&gt; &lt;subnode /&gt; &lt;/MyNode&gt; &lt;/configuration&gt; </code></pre> <ul> <li>I tried <code>/configuration/MyNode</code> which is wrong because it ignores the namespace.</li> <li>I tried <code>/configuration/lcmp:MyNode</code> which is wrong because <code>lcmp</code> is the URI, not the prefix.</li> <li>I tried <code>/configuration/{lcmp}MyNode</code> which failed because <code>Additional information: '/configuration/{lcmp}MyNode' has an invalid token.</code></li> </ul> <p>EDIT: I can't use <code>mgr.AddNamespace("df", "lcmp");</code> as some of the answerers have suggested. That requires that the XML parsing program know all the namespaces I plan to use ahead of time. Since this is meant to be applicable to any source file, I don't know which namespaces to manually add prefixes for. It seems like <code>{my uri}</code> is the XPath syntax, but Microsoft didn't bother implementing that... true?</p>
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    1. USMads Hansen
    1. USScott Stafford
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    1. COIt is not clear what you want to achieve exactly. What are the criteria that determine which nodes you are looking for? Are you looking for elements based on their namespace? In that case your code would know the namespace. As for {my uri} being "XPath syntax", where in the XPath 1.0 specification do you think has that syntax been defined? And whether you put the namespace URI in curly brackets or pass the namespace URI to the AddNamespace method shouldn't matter to your C# code, in both cases the namespace URI needs to be available as a string.
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      1. POHow do I use XPath with a default namespace with no prefix?
      1. USMartin Honnen
    2. CO@Martin: I do want to specify the namespace in the XPath, but I have only the namespace URI and no namespace prefix. I looked closer into where I 'invented' the {} from and I might have skimmed incorrectly... I got it from this reference: http://www.jclark.com/xml/xmlns.htm. Thanks for pointing that out. Of course, even if it's not valid, it seems like a useful thing to be able to do easily.. ;)
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      1. USScott Stafford
    3. COScott, you will need to choose any allowed prefix you like, associate it with the namespace URI you have using AddNamespace(prefix, namespaceURI), and use the choosen prefix in your XPath expression. That is how XPath works, at least XPath 1.0. The prefix does not have to exist in the input XML at all or can be different to one used in the input XML, the element selection will happen based on the namespace match, not the prefix.
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      1. USMartin Honnen
 

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