**The correct answer (note the brackets)**:

    (//span[@class=&#39;Big&#39;])[1]

**The following expression is wrong in the general case:**

    //span[@class=&#39;Big&#39;][1]

because it selects every `span` element in the document, that satisfies the condition in the first predicate, and that is *the first such child of its parent* -- there can be many such elements in an XML document and all of them will be selected.

For more detailed explanation see: https://stackoverflow.com/a/5818966/36305

Dimitre Novatchev&#39;s answer is correct if you are expecting the [`class`][1] attribute to be ***equal to*** `Big` (without any other classes attached to the element):

    (//span[@class=&quot;Big&quot;])[1]

... which is similar to the following JavaScript expression:

    document.querySelectorAll(&#39;span[class=&quot;Big&quot;]&#39;)[0]

&lt;hr /&gt;

On the other hand, if you are expecting `Big` to be ***one of any number*** of classes in the [`class`][1] attribute (rather than the only class), you can use the following expression:

    (//span[contains(concat(&quot; &quot;, normalize-space(@class), &quot; &quot;), &quot; Big &quot;)])[1]

... which is similar to the following JavaScript expression:

    document.querySelectorAll(&#39;span.Big&#39;)[0]

  [1]: https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/class

Which is the correct format for negating instanceof?

    if ( ! $a instanceof stdClass)

or



   
    if ( ! ($a instanceof stdClass) ) 

I&#39;ve convinced myself the latter is correct way, probably after reading a blog article several years ago, but after some command-line tests, they both seem equivalent. *Are* they?

instanceof negation

Imagine there is a class:

    @Something(someProperty = &quot;some value&quot;)
    public class Foobar {
        //...
    }

Which is already compiled (I cannot control the source), and is part of the classpath when the jvm starts up.  I would like to be able to change &quot;some value&quot; to something else at runtime, such that any reflection thereafter would have my _new value_ instead of the default &quot;some value&quot;.

Is this possible?  If so, how?

Modify a class definition&#39;s annotation string parameter at runtime

I used this Xpath expression `&quot;//span[@class=&#39;Big&#39;]&quot;` and got all elements in that page that are under `&lt;span&gt;` tag and `class=&#39;Big&#39;`.

My question is what if I want just the first occurrence on the page, not all occurrences, what would be the correct `Xpath` expression?

Thanks,
Narin

What is the XPath expression to find only the first occurrence?

I used this Xpath expression <code>"//span[@class='Big']"</code> and got all elements in that page that are under <code>&#x3C;span></code> tag and <code>class='Big'</code>.
My question is what if I want just the first occurrence on the page, not all occurrences, what would be the correct <code>Xpath</code> expression?
Thanks,
Narin

Is it possible to create an XML file with some data in JavaScript? I have the data stored in variables. 

I&#39;ve googled around a bit and it doesn&#39;t seem like it&#39;s talked about much. I thought I could use `XMLWriter` such as this:

    var XML = new XMLWriter();
    XML.BeginNode (&quot;testing&quot;);
    XML.Node(&quot;testingOne&quot;);
    XML.Node(&quot;TestingTwo&quot;);
    XML.Node(&quot;TestingThree&quot;);
    XML.EndNode();

as stated in this tutorial: [EHow Tutorial][1]

However, when I execute this code, I get the following error:

&gt; ReferenceError: XMLWriter is not defined

How can I solve this error?

  [1]: http://www.ehow.com/how_5956065_create-xml-file-javascript.html

Create XML in JavaScript

Jackson has annotations for ignoring unknown properties within a class using:

    @JsonIgnoreProperties(ignoreUnknown = true) 

It allows you to ignore a specific property using this annotation:

    @JsonIgnore

If you&#39;d like to globally set it you can modify the object mapper:

    // jackson 1.9 and before
    objectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    // or jackson 2.0
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

How do you set this globally using spring so it can be `@Autowired` at server start up without writing additional classes?

How do you globally set Jackson to ignore unknown properties within Spring?

I&#39;ve found an error on a page in my Magento application; it always show this message error when I visit it:

&gt; Fatal error: Class &#39;DOMDocument&#39; not found in /home/.../lib/Zend/Feed/Abstract.php on line 95

Can you give me a solution? I&#39;m using magento 1.4.1.1.


Class &#39;DOMDocument&#39; not found

I have two SQL Servers (running SQL Server 2008) named `DATA01` and `DATA02`. `DATA02` has a linked server definition `LINK`, that points at `DATA01`, with suitable user mapping set up. On `DATA01` there is a database `MyDatabase` containing these two tables:

    CREATE TABLE T_A (
        Id int
    )
    
    CREATE TABLE T_B (
        Id int,
        Stuff xml
    )

When I run this command from `DATA02`, I get data returned as expected:

    SELECT Id FROM LINK.MyDatabase.dbo.T_A;

However, when I run this command from `DATA02`, I get an error:

    SELECT Id, Stuff FROM LINK.MyDatabase.dbo.T_B;

The error is

&gt; Xml data type is not supported in distributed queries. Remote object &#39;DATA02.MyDatabase.dbo.T_B&#39; has xml column(s).

And strangely, this command:

    SELECT Id FROM LINK.MyDatabase.dbo.T_B;

also gives the same error, **even though I&#39;m not `SELECT`ing the xml column!** What&#39;s going on?


Why do I get the error &quot;Xml data type is not supported in distributed queries&quot; when querying a linked server for non-xml data?

I&#39;ve been trying to find some way of removing the icon/logo from the action bar but the only thing I&#39;ve found after an hour of searching SO, Android&#39;s documentation and Google is how to remove the title bar in whole. That is not what I want. Only want to remove the icon/logo from the title bar.

Any one know how to accomplish this? Preferably I&#39;d like to do this in **XML**.


Remove icon/logo from action bar on android

I would like to apply a transformation if and only if a matched element *does not* exist in the target. Trying various xpath expressions using http://webconfigtransformationtester.apphb.com/ but no luck so far.

E.g. if the target web.config looks like this:


    &lt;configuration&gt;
      &lt;system.web&gt;
        &lt;compilation debug=&quot;true&quot; /&gt;
      &lt;/system.web&gt;
    &lt;/configuration&gt;

then the output should look like this:

    &lt;configuration&gt;
      &lt;connectionStrings&gt;
        &lt;add name=&quot;MyCs&quot; provider=&quot;System.Data.SqlClient&quot; connectionString=&quot;&quot; /&gt;
        &lt;add name=&quot;SomeOtherCs&quot; provider=&quot;System.Data.SqlClient&quot; connectionString=&quot;&quot; /&gt;
      &lt;/connectionStrings&gt;
      &lt;system.web&gt;
        &lt;compilation debug=&quot;true&quot; /&gt;
      &lt;/system.web&gt;
    &lt;/configuration&gt;

But if the target looks like this:

    &lt;configuration&gt;
      &lt;connectionStrings&gt;
        &lt;add name=&quot;MyCs&quot; provider=&quot;System.Data.IChangedIt&quot; connectionString=&quot;my connection string here&quot; /&gt;
      &lt;/connectionStrings&gt;
      &lt;system.web&gt;
        &lt;compilation debug=&quot;true&quot; /&gt;
      &lt;/system.web&gt;
    &lt;/configuration&gt;

then the result of the transformation should look like this:

    &lt;configuration&gt;
      &lt;connectionStrings&gt;
        &lt;add name=&quot;MyCs&quot; provider=&quot;System.Data.IChangedIt&quot; connectionString=&quot;my connection string here&quot; /&gt;
        &lt;add name=&quot;SomeOtherCs&quot; provider=&quot;System.Data.SqlClient&quot; connectionString=&quot;&quot; /&gt;   
      &lt;/connectionStrings&gt;
      &lt;system.web&gt;
        &lt;compilation debug=&quot;true&quot; /&gt;
      &lt;/system.web&gt;
    &lt;/configuration&gt;

In other words, I just want to add the named connection string to configuration but let the administrator fill it in with his own values. I thought it would as simple as `xdt:Transform=&quot;Insert&quot; xdt:Locator=&quot;XPath(count(/configuration/connectionStrings)=0)&quot;` (to add a cs config section if none existed) but apparently not.

Web Config Transforms: Insert If Not Exists

Is there a package out there, for Ubuntu and/or CentOS, that has a command-line tool that can execute an XPath one-liner like `foo //element@attribute filename.xml` or `foo //element@attribute &lt; filename.xml` and return the results line by line?

I&#39;m looking for something that would allow me to just `apt-get install foo` or `yum install foo` and then just works out-of-the-box, no wrappers or other adaptation necessary.

Here are some examples of things that come close:

Nokogiri. If I write this wrapper I could call the wrapper in the way described above:

    #!/usr/bin/ruby

    require &#39;nokogiri&#39;

    Nokogiri::XML(STDIN).xpath(ARGV[0]).each do |row|
      puts row
    end

XML::XPath. Would work with this wrapper:

    #!/usr/bin/perl

    use strict;
    use warnings;
    use XML::XPath;

    my $root = XML::XPath-&gt;new(ioref =&gt; &#39;STDIN&#39;);
    for my $node ($root-&gt;find($ARGV[0])-&gt;get_nodelist) {
      print($node-&gt;getData, &quot;\n&quot;);
    }

`xpath` from XML::XPath returns too much noise, `-- NODE --` and `attribute = &quot;value&quot;`.

`xml_grep` from XML::Twig cannot handle expressions that do not return elements, so cannot be used to extract attribute values without further processing.

EDIT:

`echo cat //element/@attribute | xmllint --shell filename.xml` returns noise similar to `xpath`.

`xmllint --xpath //element/@attribute filename.xml` returns `attribute = &quot;value&quot;`.

`xmllint --xpath &#39;string(//element/@attribute)&#39; filename.xml` returns what I want, but only for the first match.

For another solution almost satisfying the question, here is an XSLT that can be used to evaluate arbitrary XPath expressions (requires dyn:evaluate support in the XSLT processor):

    &lt;?xml version=&quot;1.0&quot;?&gt;
    &lt;xsl:stylesheet xmlns:xsl=&quot;http://www.w3.org/1999/XSL/Transform&quot; version=&quot;1.0&quot;
        xmlns:dyn=&quot;http://exslt.org/dynamic&quot; extension-element-prefixes=&quot;dyn&quot;&gt;
      &lt;xsl:output omit-xml-declaration=&quot;yes&quot; indent=&quot;no&quot; method=&quot;text&quot;/&gt;
      &lt;xsl:template match=&quot;/&quot;&gt;
        &lt;xsl:for-each select=&quot;dyn:evaluate($pattern)&quot;&gt;
          &lt;xsl:value-of select=&quot;dyn:evaluate($value)&quot;/&gt;
          &lt;xsl:value-of select=&quot;&#39;&amp;#10;&#39;&quot;/&gt;
        &lt;/xsl:for-each&gt; 
      &lt;/xsl:template&gt;
    &lt;/xsl:stylesheet&gt;

Run with `xsltproc --stringparam pattern //element/@attribute --stringparam value . arbitrary-xpath.xslt filename.xml`.

How to execute XPath one-liners from shell?

Suppose I have this (simplified):

    &lt;form id=&quot;myform&quot;&gt;
        &lt;!-- some input fields --&gt;
        &lt;input type=&quot;submit&quot; value=&quot;proceed&quot;/&gt;
    &lt;/form&gt;

Then I can select the submit button by XPath `//form[@id=&#39;myform&#39;]/input[@type=&#39;submit&#39;]`. Great.

However, my templates might change and I want to be flexible in the depth in which the submit button is located. It might be put in a table, like this:

    &lt;form id=&quot;myform&quot;&gt;
        &lt;!-- some input fields --&gt;
        &lt;table&gt;&lt;tr&gt;&lt;td&gt;
               &lt;input type=&quot;submit&quot; value=&quot;proceed&quot;/&gt;
        &lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
    &lt;/form&gt;

I know I can select elements which are grandchildren, but I can&#39;t select grand-grand-grand-...-childeren of any depth. E.g.:

 - `//form[@id=&#39;myform&#39;]/*/input[@type=&#39;submit&#39;]` only selects grand-children, no further depths.
 - `//form[@id=&#39;myform&#39;]/*/*/input[@type=&#39;submit&#39;]` only selects grand-grand-children, no further or less depths.
 - `//form[@id=&#39;myform&#39;]/**/input[@type=&#39;submit&#39;]` is not valid.

So, how do I select this submit button reliably without using element IDs?

How do I select child elements of any depth using XPath?

I am working with the Selenium WebDriver 2.25.0 on multilingual web application &amp; mainly test the page content (For different languages like Arabic, English, Russian &amp; so on).

For my application which is better according to performance &amp; make sure that it should be support for all the browsers (i.e. IE 7,8,9, FF, Chrome etc).

Thanks in advance for your valueable suggestions.

What is the difference between cssSelector &amp; Xpath and which is better with respect to performance for cross browser testing?

I have the following document:

    &lt;a&gt;
      &lt;bb&gt;abc&lt;/bb&gt;
      &lt;cc&gt;ccc&lt;/cc&gt;
      &lt;dd&gt;ddd&lt;/dd&gt;
    &lt;/a&gt;
    &lt;a&gt;
      &lt;bb&gt;zz&lt;/bb&gt;
      &lt;cc&gt;1&lt;/cc&gt;
      &lt;dd&gt;2&lt;/dd&gt;
    &lt;/a&gt;

How can I get the value of `&lt;cc&gt;` using XPath  if `&lt;bb&gt;` is `zz`?

How to select a node using XPath if sibling node has a specific value?

I want to do so:

    ng-hide=&quot;!globals.isAdmin &amp;&amp; mapping.is_default&quot;

but the expression evaluates always to `false`.

I do not want to define special function on `$scope`.

Are complex expressions possible in ng-hide / ng-show?

I came across the following program, which compiles without errors or even warnings:

    int main(){
      &lt;:]{%&gt;; // smile!
    }
[Live example.][1]

What does the program do, and what is that smiley-expression?


  [1]: http://ideone.com/inXuVc

What is this smiley-with-beard expression: &quot;&lt;:]{%&gt;&quot;?

I want to match a regular expression on a whole word.

In the following example I am trying to match `s` or `season` but what I have matches `s`, `e`, `a`, `o` and `n`.  

    [s|season]

How do I make a regular expression to match a whole word?


Regular expression to match a word or its prefix

I am trying to display a different logo based on the users franchise number.

Parameter = UserFranNr

If the value &lt;&gt; 99 and &lt;&gt; 87, then the embedded image to display is ID0. (Embedded image names are strings.)

This works with nested IIFs but seems to be the right time/place to use `SWITCH`.

(There is a strong possibility that more franchises will use their own logo in future.)

    =Switch	
	(
	Parameters!UserFranNr.Value = &quot;99&quot;,&quot;ID99&quot;,
	Parameters!UserFranNr.Value = &quot;87&quot;,&quot;ID87&quot;,
	&quot;ID0&quot;
	)

I have not found any documentation that explains how to implement a default value using `SWITCH`.

Is this even possible? If so how? If not any decent alternatives?
Thanks

Resources:
[Expression Examples (Report Builder and SSRS)][1]
[Define Formula Dialog Box (Report Builder)][3]

Plus here and other forums.


  [1]: http://msdn.microsoft.com/en-us/library/ms157328.aspx
  [3]: http://technet.microsoft.com/en-us/library/ee240820.aspx

Report Builder 3.0 SWITCH expression DEFAULT/ELSE

Below is the content:

    Subject:
        Security ID:        S-1-5-21-3368353891-1012177287-890106238-22451
        Account Name:       ChamaraKer
        Account Domain:     JIC
        Logon ID:       0x1fffb

    Object:
        Object Server:  Security
        Object Type:    File
        Object Name:    D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log
        Handle ID:  0x11dc

I need to capture the words after the `Object Name:` word in that line. Which is `D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log`.

How can I do this?

`^.*\bObject Name\b.*$` matches - Object Name





Content Type	Original Author	Original Content on Stackoverflow
Question	Narin	View Question on Stackoverflow
Solution 1 - Xml	Dimitre Novatchev	View Answer on Stackoverflow
Solution 2 - Xml	Grant Miller	View Answer on Stackoverflow

What is the XPath expression to find only the first occurrence?

Xml Problem Overview

Xml Solutions

Solution 1 - Xml

Solution 2 - Xml

Modify a class definition's annotation string parameter at runtime

instanceof negation

Attributions