Apple Keynote Slide Combiner - Software to combine slides - Xojo / RealBasic or Other

General information for the business: This is an application component.
Description of requirements/functionality: Apple's Keynote is an application like PowerPoint. What I need to do is write software that combines two, or more, slides.

Because I have too many projects, I need someone else to do this part.

Apple's Keynote file format is a bit strange. The extension is a ".KEY" file. But the ".KEY" file is called a "Bundle." That bundle is actually a folder or zipped archive that Keynote parses.

Within the bundle, is an XML file. It's actually Apple's own XML structure called AXML (I think). That XML file holds the structure of the keynote slides. Things like, how many slides, and what JPEGs are on each slide. Think of the bundle like this:

Show.KEY --- the file bundle
Show.XML --- the XML that describes the slide deck
The fact that this slide deck has two slides,
Info about slide one
The Text for slide one,
The position of the slide and the font size/color for each text block for slide one,
The JPEG name for each JPEG on slide one,
The Text for slide two,
... and so on for slide two,
First.JPEG --- the JPEG on slide one
Second.JPEG -- the JPEG on slide two
Third.JPEG --- the JPEG also on slide two

What I need is software that will do this:
* If I have a file called ONE.KEY - a keynote file with just ONE slide,
and TWO.KEY, again, a file with just ONE side,
Output THREE.KEY - a file with both slides combined.

I'd like this software written in XoJo, or RealBaisc or RealSudio. If you can't do it in these applications, then I need the code to be well documented so that I can convert the software into these target languages.

Let me know if you have any questions.

Thanks Eric
OS requirements: Mac OS
Extra notes: