[Bug 772527] tags: Add support for remaining Dublin Core metadata

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772527

--- Comment #6 from minfrin at sharp.fm ---
> Maybe these should be moved into libgsttag into a separate
> namespace for dublin core? But generally seems fine to have
> them in core I guess, except for:

Right now we support roughly half of Dublin Core, this patch adds the other
half following the same conventions as already established.

> This seems a bit generic. DUBLIN_CORE_IDENTIFIER maybe?

The formal definition is here:

http://dublincore.org/documents/dces/

"An unambiguous reference to the resource within a given context. Recommended
best practice is to identify the resource by means of a string conforming to a
formal identification system."

Seems Dublin Core expects this to be generic.

> There's also LANGUAGE_NAME and LANGUAGE_CODE. How is this one different?

The formal defition of GST_TAG_LANGUAGE is an RFC4646 language tag. I am not
seeing that LANGUAGE_NAME or LANGUAGE_CODE have such a strict definition.

> There already is GST_TAG_PUBLISHER since 1.2

Will fix.

> GST_TAG_GENRE exists since forever already

Will fix.

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