Mike said:

Also, isnt Adobe's XMP sidecar file similar to the XML sidecar file
Aperture is creating?  I think some of wording on their advertising
implies that Aperture somehow creates a digital master file that is
different from the raw file that is downloaded.

I do like the "versioning" function they mention.  Which sounds like
more than one XML file or XML fields are created for the raw file.

Roger replies (sorry, our email system doesn't handle quoting from digests 
well!):

Yes, it's similar in concept; I don't have my copy of Aperture yet but I'd 
assume Apple is using a variant of their plist format, while Adobe uses XMP 
(which is XML-encoded RDF)... it's not clear yet (to me) what is actually 
stored in Apple's sidecars - it's apparently used as a static backup of the 
binary database (much like iTunes and iPhoto both use XML documents as mirrors 
of their binary database). But yeah, conceptually they are similar at least.

I'd grafted on versioning support for XMP a couple years ago for my own 
personal workflow, as I often render multiple renditions of my raw files... 
ugly but it works.

-R


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