Try this XPath: `//a[@id = &#39;unique-id&#39;]/@href`. This XPath will select `href` attribute of `a` element with attribute `id` = `unique-id` 

I am building up an integration test suite and there is one bit of logic that I need to have a clean database for. How can I run the `db:test:purge` task inside of one of my tests?

I am using: ruby 1.9.2, rails 3.0.9, rspec 2.6

Running Rake tasks in Rspec Tests

Does anyone know the difference between feature detection and descriptor extraction in OpenCV 2.3? 

I understand that the latter is required for matching using DescriptorMatcher. If that&#39;s the case, what is FeatureDetection used for?

What is the difference between feature detection and descriptor extraction?

I am using XPath to pull data off of a web page.

I have a link that I want to get the href value of. I can reference it through its unique id: `id(&#39;unique-id&#39;)`, but that gives me the string between the `&lt;a&gt;` tags. 

How do I get the value of the `href` attribute?

XPath to get another attribute by id attribute

I am using XPath to pull data off of a web page.
I have a link that I want to get the href value of. I can reference it through its unique id: <code>id('unique-id')</code>, but that gives me the string between the <code>&#x3C;a></code> tags.
How do I get the value of the <code>href</code> attribute?

I am Using Spring WebServiceTemplate to make webservice call which uses JAXB to generate request XML. My requirement needs all the elements (including root) to have a namespace prefix (there is only a single namespace) in the SOAP request.

Ex :

    &lt;ns1:Login xmlns:ns1=&quot;www.example.com/a&quot;&gt;
        &lt;ns1:username&gt;abc&lt;/ns1:username&gt;
        &lt;ns1:password&gt;abc&lt;/ns1:password&gt;
    &lt;/ns1:Login&gt;

But i am getting

    &lt;Login xmlns=&quot;www.example.com/a&quot;&gt;
        &lt;username&gt;abc&lt;username&gt;
        &lt;password&gt;abc&lt;password&gt;
    &lt;/Login&gt;

xsd :

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
    &lt;xs:schema targetNamespace=&quot;www.example.com/a&quot;   xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot; xmlns:ilreq=&quot;www.example.com/a&quot; elementFormDefault=&quot;qualified&quot; attributeFormDefault=&quot;unqualified&quot;&gt;
	
	&lt;xs:complexType name=&quot;Login&quot;&gt;
		&lt;xs:sequence&gt;
			&lt;xs:element name=&quot;username&quot; type=&quot;xs:string&quot;/&gt;
			&lt;xs:element name=&quot;password&quot; type=&quot;xs:string&quot;/&gt;
		&lt;/xs:sequence&gt;
	&lt;/xs:complexType&gt;
&lt;/xs:schema&gt;

Generated Java Class from XSD 


    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = &quot;Login&quot;, propOrder = {
        &quot;username&quot;,
        &quot;password&quot;
    })

    @XmlRootElement
    public class Login {

    @XmlElement(required = true)
    protected String username;
    @XmlElement(required = true)
    protected String password;
    ......
    }

package-info.java

    @javax.xml.bind.annotation.XmlSchema(
        namespace = &quot;www.example.com/a&quot;,
        elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
    package authenticator.beans.login;


Want to know how to generate the request XML with Namespace prefix to all elements including root.


JAXB :Need Namespace Prefix to all the elements

I went to file associations there was no `.xml` format, when I added it, all editors were added automatically and they are static writing me something like: 

    locked by &#39;XML&#39; content type

...can&#39;t remove association. 

I want that whenever I create an XML file, it would be opened automatically with the text editor.

Please help.

How to make XML files always open in the text editor rather than the XML editor?

I want to have an XML attribute without any value, which simply has one meaning when it exists or does not exist.

Is that valid?

Is an xml attribute without a value, valid?

Is it possible to include a link to a website in the XML documentation? For example, my method&#39;s summarized as

    ///&lt;Summary&gt;
    /// This is a math function I found HERE.
    ///&lt;/Summary&gt;
    public void SomeMathThing(Double[] doubleArray)
    {
       ...
    }

and when I type

&lt;!-- language: lang-none --&gt;

    SomeMathThing(

I want IntelliSense to show the summary with the option to click on &quot;HERE&quot; to link to an outside website. Is this possible? How would it be done?

C# XML Documentation Website Link

I am parsing an XML file using Sax Parser of Xerces.&lt;br&gt;
Is the XML declaration `&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;` required?

Does a valid XML file require an XML declaration?

I&#39;m running over all textnodes of my DOM and check if the nodeValue contains a certain string.

    /html/body//text()[contains(.,&#39;test&#39;)]
This is case sensitive. However, I also want to catch `Test`, `TEST` or `TesT`. Is that possible with XPath (in JavaScript)?

Case insensitive XPath contains() possible?

What is involved in upgrading from XSLT 1.0 to 2.0?  
1 - What are the possible reasons for upgrading?  
2 - What are the possible reasons for NOT upgrading?  
3 - And finally, what are the steps to upgrading?

I&#39;m hoping for an executive summary--the short version :)

Upgrading XSLT 1.0 to XSLT 2.0

What XPath can I use to select any category with a name attribute specified and any child node author with the value specified.

I&#39;ve tried different variations of the path below with no success:

    //quotes/category[@name=&#39;Sport&#39; and author=&quot;James Small&quot;]

The XML:


    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;quotes&gt;
      &lt;category name=&quot;Sport&quot;&gt;
       &lt;author&gt;James Small&lt;quote date=&quot;09/02/1985&quot;&gt;Quote One&lt;/quote&gt;&lt;quote             date=&quot;11/02/1925&quot;&gt;Quote nine&lt;/quote&gt;&lt;/author&gt;
      &lt;/category&gt;
       &lt;category name=&quot;Music&quot;&gt;
       &lt;author&gt;Stephen Swann
     &lt;quote date=&quot;04/08/1972&quot;&gt;Quote eleven&lt;/quote&gt;&lt;/author&gt;
      &lt;/category&gt;
      &lt;/quotes&gt;



XPath with multiple conditions

    &lt;a&gt;
    	&lt;xsl:attribute name=&quot;href&quot;&gt; 
    	 &lt;xsl:value-of select=&quot;/*/properties/property[@name=&#39;report&#39;]/@value&quot; /&gt;
    	&lt;/xsl:attribute&gt;
    &lt;/a&gt;	

Is there any way to concat another string to

    &lt;xsl:value-of select=&quot;/*/properties/property[@name=&#39;report&#39;]/@value&quot;  /&gt;

I need to pass some text to href attribute in addition to the report property value


How to concat a string to xsl:value-of select=&quot;...?

Currently i have a xsl with following code where I&#39;m trying print out &quot;count&quot; only if it is not equal to `N/A`. but seems like `&quot;!=&quot;` is not working. 

    &lt;xsl:for-each select=&quot;Directory/Match&quot;&gt;
        &lt;xsl:if test = &quot;Count != N/A&quot;&gt;
            &lt;tr&gt;
                &lt;td&gt;&lt;xsl:value-of select=&quot;@bookName&quot; /&gt;&lt;/td&gt;
                &lt;td&gt;&lt;xsl:value-of select=&quot;@AuthorName&quot; /&gt;&lt;/td&gt;
                &lt;td&gt;&lt;xsl:value-of select=&quot;Count&quot; /&gt;&lt;/td&gt;
            &lt;/tr&gt;
        &lt;/xsl:if&gt;
    &lt;/xsl:for-each&gt;

However, it works if I try to compare it with numeric value.

Example:

    &lt;xsl:if test = &quot;Occurrances != 0&quot;&gt;

Can someone please tell me: If I would like to compare strings what can I use?


How do I specify &quot;not equals to&quot; when comparing strings in an XSLT &lt;xsl:if&gt;?

I&#39;ve come up kinda dry as to **why** -- at least in the .Net Framework -- it is necessary to use an `XmlNamespaceManager` in order to handle namespaces (or the rather clunky and verbose `[local-name()=...` XPath predicate/function/whatever) when performing XPath queries. I **do** understand why namespaces are necessary or at least beneficial, but **why** is it so complex?

In order to query a simple XML Document (no namespaces)...

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;
    &lt;rootNode&gt;
       &lt;nodeName&gt;Some Text Here&lt;/nodeName&gt;
    &lt;/rootNode&gt;

...one can use something like `doc.SelectSingleNode(&quot;//nodeName&quot;)` (which would match `&lt;nodeName&gt;Some Text Here&lt;/nodeName&gt;`)

*Mystery #1*: **My first annoyance** -- If I understand correctly -- is that merely adding a namespace reference to the parent/root tag (whether used as part of a child node tag or not) like so:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;
    &lt;rootNode xmlns=&quot;http://example.com/xmlns/foo&quot;&gt;
       &lt;nodeName&gt;Some Text Here&lt;/nodeName&gt;
    &lt;/rootNode&gt;

...requires several extra lines of code to get the same result:

    Dim nsmgr As New XmlNamespaceManager(doc.NameTable)
    nsmgr.AddNamespace(&quot;ab&quot;, &quot;http://example.com/xmlns/foo&quot;)
    Dim desiredNode As XmlNode = doc.SelectSingleNode(&quot;//ab:nodeName&quot;, nsmgr)
...essentially dreaming up a non-existent prefix (&quot;`ab`&quot;) to find a node that doesn&#39;t even use a prefix. *How does this make sense?* What is wrong (conceptually) with `doc.SelectSingleNode(&quot;//nodeName&quot;)`?

*Mystery #2*: So, say you&#39;ve got an XML document that uses prefixes:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;
    &lt;rootNode xmlns:cde=&quot;http://example.com/xmlns/foo&quot; xmlns:feg=&quot;http://example.com/xmlns/bar&quot;&gt;
       &lt;cde:nodeName&gt;Some Text Here&lt;/cde:nodeName&gt;
       &lt;feg:nodeName&gt;Some Other Value&lt;/feg:nodeName&gt;
       &lt;feg:otherName&gt;Yet Another Value&lt;/feg:otherName&gt;
    &lt;/rootNode&gt;

... If I understand correctly, you would have to add both namespaces to the `XmlNamespaceManager`, in order to make a query for a single node...

    Dim nsmgr As New XmlNamespaceManager(doc.NameTable)
    nsmgr.AddNamespace(&quot;cde&quot;, &quot;http://example.com/xmlns/foo&quot;)
    nsmgr.AddNamespace(&quot;feg&quot;, &quot;http://example.com/xmlns/bar&quot;)
    Dim desiredNode As XmlNode = doc.SelectSingleNode(&quot;//feg:nodeName&quot;, nsmgr)

... Why, in this case, do I need (conceptually) a namespace manager? 

******REDACTED into comments below****

**Edit Added:**
My revised and refined question is based upon the apparent redundancy of the XmlNamespaceManager in what I believe to be the majority of cases and the use of the namespace manager to specify a mapping of prefix to URI:

When the direct mapping of the namespace prefix (&quot;cde&quot;) to the namespace URI (&quot;http://example.com/xmlns/foo&quot;) is explicitly stated in the source document: 

    ...&lt;rootNode xmlns:cde=&quot;http://example.com/xmlns/foo&quot;...

what is the conceptual need for a programmer to recreate that mapping before making a query?

Why is XmlNamespaceManager necessary?

Is there a way to define a XPath type query for nested python dictionaries.

Something like this:

    foo = {
      &#39;spam&#39;:&#39;eggs&#39;,
      &#39;morefoo&#39;: {
                   &#39;bar&#39;:&#39;soap&#39;,
                   &#39;morebar&#39;: {&#39;bacon&#39; : &#39;foobar&#39;}
                  }
       }

    print( foo.select(&quot;/morefoo/morebar&quot;) )
    
    &gt;&gt; {&#39;bacon&#39; : &#39;foobar&#39;}

I also needed to select nested lists ;)

This can be done easily with @jellybean&#39;s solution:

    def xpath_get(mydict, path):
        elem = mydict
        try:
            for x in path.strip(&quot;/&quot;).split(&quot;/&quot;):
                try:
                    x = int(x)
                    elem = elem[x]
                except ValueError:
                    elem = elem.get(x)
        except:
            pass
    
        return elem
    
    foo = {
      &#39;spam&#39;:&#39;eggs&#39;,
      &#39;morefoo&#39;: [{
                   &#39;bar&#39;:&#39;soap&#39;,
                   &#39;morebar&#39;: {
                               &#39;bacon&#39; : {
                                           &#39;bla&#39;:&#39;balbla&#39;
                                         }
                               }
                  },
                  &#39;bla&#39;
                  ]
       }
    
    print xpath_get(foo, &quot;/morefoo/0/morebar/bacon&quot;)

[EDIT 2016] This question and the accepted answer are ancient. The newer answers may do the job better than the original answer. However I did not test them so I won&#39;t change the accepted answer.

Xpath like query for nested python dictionaries

So, I was absolutely baffled as to how to do this in Selenium, and couldn&#39;t find the answer anywhere, so I&#39;m sharing my experience.

I was trying to select an iframe and having no luck (or not repeatably anyway). The HTML is:

    &lt;iframe&#160;id=&quot;upload_file_frame&quot;&#160;width=&quot;100%&quot;&#160;height=&quot;465px&quot;&#160;frameborder=&quot;0&quot;&#160;framemargin=&quot;0&quot;&#160;name=&quot;upload_file_frame&quot;&#160;src=&quot;/blah/import/&quot;&gt;
	&lt;html&gt;
		&lt;body&gt;
			&lt;div&#160;class=&quot;import_devices&quot;&gt;
				&lt;div&#160;class=&quot;import_type&quot;&gt;
					&lt;a&#160;class=&quot;secondary_button&quot;&#160;href=&quot;/blah/blah/?source=blah&quot;&gt;
						&lt;div&#160;class=&quot;import_choice_image&quot;&gt;
							&lt;img&#160;alt=&quot;blah&quot;&#160;src=&quot;/public/images/blah/import/blah.png&quot;&gt;
						&lt;/div&gt;
						&lt;div&#160;class=&quot;import_choice_text&quot;&gt;Blah Blah&lt;/div&gt;
					&lt;/a&gt;
				&lt;/div&gt;
			&lt;/div&gt;
		&lt;/body&gt;
	&lt;/html&gt;
&lt;/iframe&gt;

The Python code (using the selenium library) was trying to find this iframe using this:

        @timed(650)
    def test_pedometer(self):
        sel = self.selenium
        ...
        time.sleep(10)
        for i in range(5):
            try:
                if sel.select_frame(&quot;css=#upload_file_frame&quot;): break
            except: pass
            time.sleep(10)
        else: self.fail(&quot;Cannot find upload_file_frame, the iframe for the device upload image buttons&quot;)

Repeated fails with every combination of Selenium commands I could find. 

The occasional success would not be reproducible, so perhaps it was some sort of race condition or something? Never did find the right way to get it in selenium proper.

Select iframe using Python + Selenium

I&#39;m trying to query an xml file generated by adium. xmlwf says that it&#39;s well formed. By using xmllint&#39;s debug option i get the following:

    $ xmllint --debug doc.xml
    DOCUMENT
    version=1.0
    encoding=UTF-8
    URL=doc.xml
    standalone=true
      ELEMENT chat
        default namespace href=http://purl.org/net/ulf/ns/0.4-02
        ATTRIBUTE account
          TEXT
            content=foo@bar.com
        ATTRIBUTE service
          TEXT compact
            content=MSN
        TEXT compact
          content= 
        ELEMENT event
          ATTRIBUTE type

Everything seems to parse just fine. However, when I try to query even the simplest things, I don&#39;t get anything:

    $ xmllint --xpath &#39;/chat&#39; doc.xml 
    XPath set is empty

What&#39;s happening? Running that exact same query using xpath returns the correct results (however with no newline between results). Am I doing something wrong or is xmllint just not working properly?

Here&#39;s a shorter, anonymized version of the xml that shows the same behavior:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; ?&gt;
    &lt;chat xmlns=&quot;http://purl.org/net/ulf/ns/0.4-02&quot; account=&quot;foo@bar.com&quot; service=&quot;MSN&quot;&gt;
    &lt;event type=&quot;windowOpened&quot; sender=&quot;foo@bar.com&quot; time=&quot;2011-11-22T00:34:43-03:00&quot;&gt;&lt;/event&gt;
    &lt;message sender=&quot;foo@bar.com&quot; time=&quot;2011-11-22T00:34:43-03:00&quot; alias=&quot;foo&quot;&gt;&lt;div&gt;&lt;span style=&quot;color: #000000; font-family: Helvetica; font-size: 12pt;&quot;&gt;hi&lt;/span&gt;&lt;/div&gt;&lt;/message&gt;
    &lt;/chat&gt;

Content Type	Original Author	Original Content on Stackoverflow
Question	user151841	View Question on Stackoverflow
Solution 1 - Xml	Kirill Polishchuk	View Answer on Stackoverflow

XPath to get another attribute by id attribute

Xml Problem Overview

Xml Solutions

Solution 1 - Xml

What is the difference between feature detection and descriptor extraction?

Running Rake tasks in Rspec Tests

Attributions