The Export action can export four types of image from Aperture:

Export Version - this is the regular export using an existing image export preset.

Export Master - export the Master files, with the option of adding XMP sidecar files or embedding metadata. Note that exporting Masters is disabled for Aperture 1.5.6 due to an AppleScript bug.

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Post Export actions are performed on exported files after they are exported from Aperture.

Add to Keynote Presentation will add the exported files to a Keynote presentation, with title and body text taken from that Version's metadata.

This action will load up a Keynote presentation set up by you as a template. For each Version, a new slide will be created at the end of the slideshow, the exported Version will be added to the middle of the slide and nudged into position and the title and body text of the slide will be set according to the metadata you choose.

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Post Export actions are performed on exported files after they are exported from Aperture.

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Set Metadata will set the value of the relevant metadata tag for the Version. This is currently limited to IPTC tags, custom tags, the Version Name and the Rating. EXIF data is not supported as Aperture does not provide a way of setting this.

You can either enter a fixed value, or use text from previous Nodes in the workflow.

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Burn Folders from Masters will create a series of Burn Folders in the Finder, containing aliases to the original Masters, whether they are managed or referenced.

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Add Finder Sub-folder will add extra sub-folders in the destination folder for all Versions that pass through this Node. Use '/' characters to add nested sub-folders.

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Find All Albums will look through all Albums in the Library to find out which ones contain the Version. These Albums will then be listed in the Report window.

In Aperture 1.0.60 and above and Aperture 2.1 and above, the Album IDs will also be listed, and clicking on the ID will reveal that Album in Aperture.

Note - Smart Albums are not searched.