File origin metadata

[Claes at work]

I stumbled upon the Shared file metadata spec
(http://freedesktop.org/wiki/Standards_2fshared_2dfilemetadata_2dspec)
and came to think of something that might be useful to indexers and
related program: file origins. When a file is downloaded, saved or
extracted from an archive, an extended attribute (EA) could be set to
specify the origin. For downloaded files, it could be the url where it
was downloaded from. When an attachment is saved from an email
message, it could be the Message-ID of the email message. When a file
is extracted from a tar archive, it could be the path to the original
tar file. When a file is created by any regular program, it could be
the application name of the program. A copied file could have the
source path as origin. This information could work for desktop
indexers just like hyperlinks works for Google.

Would such a recommendation be useful?

Claes