modify XMP data (Python/Windows)

[Alan G Isaac]

I want to modify XMP data for a bunch of JPEG files,
using Python if possible, on Windows.  I expected
PIL would support this.  But no?

I found the Python XMP Toolkit
http://www.spacetelescope.org/static/projects/python-xmp-toolkit/docs/installation.html#requirements
but no reports of successful use on Windows.

I found Chilkat's XMP library
http://www.chilkatsoft.com/python-xmp.asp
but it is not open source and I found no encouraging reviews.

Is there a Python package providing functinonality comparable
to Image::ExifTool (perl)?

Thanks,
Alan Isaac