Metadata Meets Physics
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While researching for an article, I came across this quote from Sam Ruby:
The accuracy of metadata is inversely proportional to the square of the distance between the data and the metadata.
In other words, the farther you put the storage of the metadata describing something from the thing it describes, the correctness/utility/usefulness of the metadata goes down. And not just down slowly, but way down, by a square factor.
While Mr Ruby might have a tough time proving that or even empirically measuring it, it does seem to make sense. Probabilistically, you're more likely to update metadata describing a document if that metadata is right there, stored with the document itself.
As another example, look at my iTunes library. So long as I access music and other media through iTunes, I'll have useful, accurate, and up-to-date metadata. If I go through the filesystem and completely ignore the iTunes Music Library.xml file, I'm stuck with whatever ID3 tags are embedded in a file ... if any.
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