Will somebody please post an Aperture-written xmp file *with* custom metadata in it - thanks.

Question

It is my understanding that Adobe's migration tool will NOT support transferal of custom metadata from Aperture to Lightroom.
I have recently enhanced my Custom Metadata plugin to read custom metadata from Expression Media xmp, and it seems like a no-brainer to have a "preset" which can read/import/transfer custom metadata from Aperture xmp too - I just need a sample to work with - thanks.
If you don't want to post here, please send directly to me.
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Rob

Answer 1

To attempt a wrap-up for this thread:
Aperture does NOT provide a means to save custom metadata in XMP - the initial premise of this thread was incorrect: a thank you to John Beardsworth for setting me straight. Specific question asked has been answered.
The purpose for the thread however was to learn how to get information out of Aperture so it can be gotten into Lightroom (final destination: custom metadata fields).
Here is one way to get custom metadata in Aperture to custom metadata in Lightroom, recommended if you have enough free IPTC fields to house the custom data temporarily:
* Create an applescript file with the following contents, modified to support your custom metadata fields; note: it must also be modified to specify the IPTC fields to be used:
tell application “Aperture”
    set imageSel to the selection
    repeat with i from 1 to count of imageSel
        tell library 1
            tell item i of imageSel
                set customFieldValue to value of custom tag "myCustomFieldName"
                set value of IPTC tag "myFreeIptcFieldName" to customFieldValue
            end tell
        end tell
    end repeat
end tell
Note: you must adapt script depending on your custom fields, and which IPTC fields you have free.
* Select photos in Aperture.
* Execute the script.
* Once photos are in Lightroom, with IPTC fields populated.., then in Lr's plugin manager, with 'Custom Metadata' plugin selected, click 'Transfer Metadata' button, then "follow the yellow-brick road" (you will be prompted with instructions..). Metadata will be transferred from IPTC fields to custom metadata in Lightroom.
If you do NOT have sufficient IPTC fields to use, or would rather not use IPTC fields for this, then you'd have to modify the script to populate a row in a CSV file for each photo, then use the 'Import from CSV' function in Custom Metadata plugin. I can help if it comes to this..
PS - There may be other ways as well, but maybe this is enough..
Rob