Hi,

I'm trying to select all the parents that have a child node matching a
certain value. It's basically transforming a blog RSS feed and I only want
to select those posts that have a specific tag.

The feed looks like this:
<feed>
	<post>
		<title>Title of the post 1</title>
		<tags>
			<tag>example</tag>
		</tags> 
	</post>
	<post>
		<title>Title of the post 2</title>
		<tags>
			<tag>example2</tag>
		</tags> 
	</post>
	<post>
		<title>Title of the post 3</title>
		<tags>
			<tag>example</tag>
			<tag>example3</tag>
		</tags> 
	</post>
</feed>

In this example I want posts 1 and 3.

I've had a Google around but I've not found any definitive answer. I was
thinking of an if statement but I would like to look the latest x posts and
I'm not sure how I can do that using an if statement as postion() is
incremental regardless of the quantifier.

TIA

Tim