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Re: Xpath query to return "NULL" values?

From: Martin Honnen <mahotrash@-----.-->
To: NULL
Date: 6/5/2009 1:23:00 PM

Mario Splivalo wrote:
> Here is my XML document:
> 
> <a>
>   <b>1</b>
>   <b>2</b>
>   <b></b>
>   <b>3</b>
> </a>
> 
> When I execute this XPath query against it: /a/b/text()
> 
> I get only 1, 2 and 3:
> 
> mario@mike:~$ echo "<a><b>1</b><b>2</b><b></b><b>3</b></a>" | xpath -e '/a/b/@id'

Why /a/b/@id? There is no 'id' attribute in there at all.

> Is there a way to extract that NULL-valued node?

There is an empty 'b' element in there. If you want to select all 'b' 
elements then use the XPath
   /a/b
if you only want the empty 'b' elements then use
   /a/b[not(node())]

-- 

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/

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