Use WebDAV custom properties to tag/categorize files

[alexisread]

This request mainly arose from a need to sort files by 2 taxonomies. I can see that this idea has been used before in other WebDAV systems and there appear to be 2 main ways to use the custom properties:

1. Tag files with multiple properties eg. Weddings, Birthdays, Holidays.
   Owncloud could then filter/sort on these custom properties in a similar fashion to Sharepoint document libraries.

2. Tag files with a view property eg. ViewByNumberOfLegs, ViewByNumberOfWings.
   The view property references an xml document defining the tree hierarchy of files
   for that view. Owncloud could then switch the entire folder view depending on the
   custom property requested.

Both approaches would work fine with WebDAV clients (default view needed though for no view requested) and allow people to move to a cross-platform metadata filesystem over time.

In terms of Owncloud alterations, you'd need a UI for creating custom WebDAV properties, and either a UI switch between views (you could use the standard folder creation UI, and a sendToView option for moving/copying files), or a multi-select filter list (eg. Weddings AND Funerals).

I've looked through the forums, but I've not seen this request before. Does this functionality exist in Owncloud? I know that custom properties have been used before an an owncloud namespace (share), so hopefully this can be seen as only a bit of work for a big win.

Thanks

[jancborchardt]

This is a duplicate of #3812 (global grouping/tagging system)