    //node[not(@*)]

That&#39;s the XPath to select all nodes named &quot;node&quot; in the document without any attributes.

    //node[count(@*)=0]

Will select all &amp;lt;node&amp;gt; with zero attributes

To address Marek Czaplicki&#39;s comment and expand the answer

    //node[not(@*) or not(string-length(@*))]

....will select all node elements with zero attributes OR which have attributes that are all empty. If it was just a particular attribute you are interested in, rather than all of them, then you could use

    //node[not(@attribute1) or not(string-length(@attribute1))]

...and this would select all node elements that either don&#39;t have an attribute called `attribute1` OR which have an `attribute1` attribute that is empty.

That is, the following elements would be picked out by either of these xpath expressions

    &lt;nodes&gt;
        &lt;node attribute1=&quot;aaaa&quot;&gt;&lt;/node&gt;
        &lt;node attribute1=&quot;&quot;&gt;&lt;/node&gt; &lt;!--This one --&gt;
        &lt;node attribute1=&quot;bbbb&quot;&gt;&lt;/node&gt;
        &lt;node&gt;&lt;/node&gt; &lt;!--...and this one --&gt;
    &lt;/nodes&gt;

See jsfiddle example [here][1]


  [1]: http://jsfiddle.net/7yucas3x/

Here&#39;s a simplified version of what I&#39;m trying to do:

    var days = new Dictionary&lt;int, string&gt;();
    days.Add(1, &quot;Monday&quot;);
    days.Add(2, &quot;Tuesday&quot;);
    ...
    days.Add(7, &quot;Sunday&quot;);
    
    var sampleText = &quot;My favorite day of the week is &#39;xyz&#39;&quot;;
    var day = days.FirstOrDefault(x =&gt; sampleText.Contains(x.Value));

Since &#39;xyz&#39; is not present in the dictionary, the FirstOrDefault method will not return a valid value. I want to be able to check for this situation but I realize that I can&#39;t compare the result to &quot;null&quot; because KeyValuePair is a struc. The following code is invalid:

    if (day == null) {
        System.Diagnotics.Debug.Write(&quot;Couldn&#39;t find day of week&quot;);
    }

We you attempt to compile the code, Visual Studio throws the following error: 

    Operator &#39;==&#39; cannot be applied to operands of type &#39;System.Collections.Generic.KeyValuePair&lt;int,string&gt;&#39; and &#39;&lt;null&gt;&#39;

How can I check that FirstOrDefault has returned a valid value?


How can I make sure that FirstOrDefault&lt;KeyValuePair&gt; has returned a value

How do I disable assertions in Python?

That is, if an assertion fails, I don&#39;t want it to throw an `AssertionError`, but to keep going.

How do I do that?

Disable assertions in Python

Using XPath, how to select nodes which have no attributes (where attribute count = 0)?

For example:

    &lt;nodes&gt;
        &lt;node attribute1=&quot;aaaa&quot;&gt;&lt;/node&gt;
        &lt;node attribute1=&quot;bbbb&quot;&gt;&lt;/node&gt;
        &lt;node&gt;&lt;/node&gt; &lt;- FIND THIS
    &lt;/nodes&gt;

XPath: How to select nodes which have no attributes?

Using XPath, how to select nodes which have no attributes (where attribute count = 0)?
For example:
<pre><code class="hljs language-php-template">&#x3C;nodes>
 &#x3C;node attribute1="aaaa">&#x3C;/node>
 &#x3C;node attribute1="bbbb">&#x3C;/node>
 &#x3C;node>&#x3C;/node> &#x3C;- FIND THIS
&#x3C;/nodes>
</code></pre>

I am having a problem selecting nodes by attribute when the attributes contains more than one word.  For example:

    &lt;div class=&quot;atag btag&quot; /&gt;

This is my xpath expression: 

`//*[@class=&#39;atag&#39;]`

The expression works with 

`&lt;div class=&quot;atag&quot; /&gt;` 

but not for the previous example.  How can I select the `&lt;div&gt;`?


How can I match on an attribute that contains a certain string?

Suppose I have the following XML:

&lt;!--language: lang-xml--&gt;

    &lt;book category=&quot;CLASSICS&quot;&gt;
      &lt;title lang=&quot;it&quot;&gt;Purgatorio&lt;/title&gt;
      &lt;author&gt;Dante Alighieri&lt;/author&gt;
      &lt;year&gt;1308&lt;/year&gt;
      &lt;price&gt;30.00&lt;/price&gt;
    &lt;/book&gt;

    &lt;book category=&quot;CLASSICS&quot;&gt;
      &lt;title lang=&quot;it&quot;&gt;Inferno&lt;/title&gt;
      &lt;author&gt;Dante Alighieri&lt;/author&gt;
      &lt;year&gt;1308&lt;/year&gt;
      &lt;price&gt;30.00&lt;/price&gt;
    &lt;/book&gt;

    &lt;book category=&quot;CHILDREN&quot;&gt;
      &lt;title lang=&quot;en&quot;&gt;Harry Potter&lt;/title&gt;
      &lt;author&gt;J K. Rowling&lt;/author&gt;
      &lt;year&gt;2005&lt;/year&gt;
      &lt;price&gt;29.99&lt;/price&gt;
    &lt;/book&gt;

    &lt;book category=&quot;WEB&quot;&gt;
      &lt;title lang=&quot;en&quot;&gt;XQuery Kick Start&lt;/title&gt;
      &lt;author&gt;James McGovern&lt;/author&gt;
      &lt;author&gt;Per Bothner&lt;/author&gt;
      &lt;author&gt;Kurt Cagle&lt;/author&gt;
      &lt;author&gt;James Linn&lt;/author&gt;
      &lt;author&gt;Vaidyanathan Nagarajan&lt;/author&gt;
      &lt;year&gt;2003&lt;/year&gt;
      &lt;price&gt;49.99&lt;/price&gt;
    &lt;/book&gt;

    &lt;book category=&quot;WEB&quot;&gt;
      &lt;title lang=&quot;en&quot;&gt;Learning XML&lt;/title&gt;
      &lt;author&gt;Erik T. Ray&lt;/author&gt;
      &lt;year&gt;2003&lt;/year&gt;
      &lt;price&gt;39.95&lt;/price&gt;
    &lt;/book&gt;

I would like to do an xpath that gets back all book nodes that have a title node with a language attribute of &quot;it&quot;. 

My attempt looked something like this:

`//book[title[@lang=&#39;it&#39;]]`

But that didn&#39;t work. I expect to get back the nodes:

&lt;!--language: lang-xml--&gt;

    &lt;book category=&quot;CLASSICS&quot;&gt;
      &lt;title lang=&quot;it&quot;&gt;Purgatorio&lt;/title&gt;
      &lt;author&gt;Dante Alighieri&lt;/author&gt;
      &lt;year&gt;1308&lt;/year&gt;
      &lt;price&gt;30.00&lt;/price&gt;
    &lt;/book&gt;

    &lt;book category=&quot;CLASSICS&quot;&gt;
      &lt;title lang=&quot;it&quot;&gt;Inferno&lt;/title&gt;
      &lt;author&gt;Dante Alighieri&lt;/author&gt;
      &lt;year&gt;1308&lt;/year&gt;
      &lt;price&gt;30.00&lt;/price&gt;
    &lt;/book&gt;

Any hints?


Get nodes where child node contains an attribute

I am trying to find the last element in my xml, which looks like:

        &lt;list&gt;
            &lt;element name=&quot;A&quot; /&gt;
            &lt;element name=&quot;B&quot; &gt;
                &lt;element name=&quot;C&quot; /&gt;
                &lt;element name=&quot;D&quot; &gt;
                    &lt;element name=&quot;D&quot; /&gt;
                    &lt;element name=&quot;E&quot; /&gt;
                    &lt;element name=&quot;F&quot; /&gt;
                    &lt;element name=&quot;G&quot; /&gt;
                &lt;/element&gt;
            &lt;element name=&quot;H&quot; /&gt;
            &lt;element name=&quot;I&quot; /&gt;
        &lt;/list&gt;

I need to get some kind of reverse menu, where current element and parents are highlighted as &quot;active&quot; and sibling as &quot;inactive&quot;. Instead in result I have a messy tree only when  I suppose &quot;D&quot; element clicked.

Double D elements are my problem. When I use 
`select=&quot;//element[@name=&#39;D&#39;][last()]&quot;` or `select=&quot;//element[@name=&#39;D&#39; and last()]&quot;` (btw which one is correct?) first time _first occurrence of_ D element is selected (debugger shows that). Here is xsl

    &lt;xsl:template match=&quot;list&quot;&gt;
        &lt;xsl:apply-templates select=&quot;//navelement[@name = &#39;D&#39;][last()]&quot; mode=&quot;active&quot;/&gt;
    &lt;/xsl:template&gt;
    
    &lt;xsl:template match=&quot;element&quot;&gt;
        &lt;ul class=&quot;menu&quot;&gt;
    	&lt;xsl:apply-templates select=&quot;preceding-sibling::node()&quot; mode=&quot;inactive&quot;/&gt;
    	    &lt;li&gt;&lt;a&gt;....&lt;/a&gt;&lt;/li&gt;
    	&lt;xsl:apply-templates select=&quot;following-sibling::node()&quot; mode=&quot;inactive&quot;/&gt;
        &lt;/ul&gt;	
        &lt;xsl:apply-templates select=&quot;parent::element&quot; mode=&quot;active&quot;/&gt;
    &lt;/xsl:template&gt;
    
    &lt;xsl:template match=&quot;element&quot; mode=&quot;inactive&quot;&gt;
    	    &lt;li&gt;&lt;a&gt;....&lt;/a&gt;&lt;/li&gt;
    &lt;/xsl:template&gt;

XSLT getting last element

.NET 3.5 doesn&#39;t completely support XPATH 2.0 or XSLT 2.0, which is just too bad. Does anyone know if these two will be included and **fully supported** in any future .NET versions?

XPath and XSLT 2.0 for .NET?

I want to write something of the sort:

    //a[not contains(@id, &#39;xx&#39;)]

(meaning all the links that there &#39;id&#39; attribute doesn&#39;t contain the string &#39;xx&#39;)

I can&#39;t find the right syntax.

Content Type	Original Author	Original Content on Stackoverflow
Question	Zanoni	View Question on Stackoverflow
Solution 1 - Xpath	48klocs	View Answer on Stackoverflow
Solution 2 - Xpath	erik	View Answer on Stackoverflow
Solution 3 - Xpath	phil	View Answer on Stackoverflow

XPath: How to select nodes which have no attributes?

Xpath Problem Overview

Xpath Solutions

Solution 1 - Xpath

Solution 2 - Xpath

Solution 3 - Xpath

Disable assertions in Python

How can I make sure that FirstOrDefault<KeyValuePair> has returned a value

Attributions