Best XML DB for a PHP website?

I'm planning on writing a RSS Feed Aggregator with a team, but I'm wondering what XML Database we should us开发者_运维百科e. The server currently runs IIS 6.0 with PHP 5.3.0 x64, I understand already that I need both a server application and a PHP extension.

What I've discovered already:

• Galax
  • Have previously used this at university, but I can't find information about it on google, it tends to show information about something else named Galax or the Galaxy...
• eXist
  • Together with Phexist this seems like a last resort, although it's dated from 2007.
  • Bad documentation.
  • Wondering if it has all features I will need through the development.
• Sedna
  • Looks professional and does have API support for PHP.
  • Good documentation!
  • Wondering if it has any disadvantages.
• Berkeley DB XML
  • Also looks professional, Oracle is well-known and I have heard of Berkeley before...
  • Can't find documentation right away, only an old presentation.
  • I will have to mess around with trying to get the PHP extension to compile.
• Saxon
  • Hard to set-up in PHP and seems bloated and unstable when you do so.
• ...
  • Are there any other solutions?
  • Is PHP good enough for this?

I would love to hear your opinions on the best way to accomplish this, thanks in advance!

DB2 ($$$) has great XML integration - but you pay for it. This is what we use where I work. You will have to (should anyway) be running the latest PHP if you're going to use PDO to interface to it.

I assume you're looking for a database that can natively handle XML. From my understanding (hearsay) Oracle and MS-SQL also handle XML but they are not as polished.

In the Open Source world I dont know what to recommend for tight XML integration.

-CF