Hi!

> Hi Eric. Extended attributes (often abbreviated as xattr) are a given in
> all modern file systems. Basically, extended attributes are metadata
> fields which, in addition to the standard fields (date_created,
> date_modified, size, read_only, hidden, etc), the user can arbitrarily
> create, for his own use. For instance, such attributes may be defined
> as: library_classification, product_quality, contacted_before, etc.
> This way, each file is turned into a database record...

Interesting. I was rather thinking about old extra attributes
such as the Linux "immutable" flag or the general ACL idea of
extended file access permissions. Regarding tagging, I think
the typical DOS way to do that would be to store tags in some
separate file, either per directory or globally. There are a
few shells which implement things like long file names and/or
comments for files that way :-)

> tagging is ubiquitous, on all systems. Pictures are tagged, emails are
> tagged, any file can be tagged. Then, file retrieval is done via the
> tags, and searches often take place across the directories.
> 
> For extended attributes, see:
> http://en.wikipedia.org/wiki/Extended_file_attributes
> 
> While modern file systems have many more features, I am interested only
> in extended attributes, for tagging purposes.
> 
> I hope this explained it.
> 
> Cheers

Yes that explains it. Thanks!

Eric



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