Depending if you are asking about descriptive, administrative, technical or preservation, there are a lot f metadata standards and schema.  Some that haven't been yet mentioned are:

VRA Core 3.0 (Visual Resources Association, Core 3.0) for visual material
PREMIS (Preservation Metadata Implementation Strategies)
EAD (Encoded Archival Description) expressed usually as XML
METS (metadata encoded transmission standard)
MODS (metadata object description schema)   [see: http://www.loc.gov/standards/mods/tools_for_mods.php] also see: http://credo.library.umass.edu/SCUAMODSGuidelines2012.pdf

Systems :
VRA Core is implemented for image collections management include, IRIS
EAD is implemented for archives collections management in ArchivistsToolkit, Archon, ArchivesSpace and AtoM.
 
Also, have you taking a look at the Seeing Standards visualization of metadata (it doesn't have preservation metadata) that Jen Riley created some years ago and is still a very good reference of the types of md that is used by domain and for forms and formats of content?   http://www.dlib.indiana.edu/~jenlrile/metadatamap/

Kari Smith
MIT Institute Archives and Special Collections

________________________________________
From: Code for Libraries [[log in to unmask]] on behalf of Eric Phetteplace [[log in to unmask]]
Sent: Wednesday, October 29, 2014 15:29
To: [log in to unmask]
Subject: Re: [CODE4LIB] Metadata

Of course, MARC. I use Millennium ILS' bulk editing modules (Rapid|Global
Update) or pymarc.

We have a digital repository, EQUELLA, which lets you use custom metadata
schemas or preconfigured ones. We use a heavily modified MODS schema.
Format is XML.

I haven't done a ton of XML processing but I edit in Sublime Text and not a
specialized XML editor like Oxygen. Plug-ins like Emmet, XML lint, and the
built-in regex search-and-replace save me some time. On the command line, I
use typical UNIX text processing tools like sed but will probably find a
need for xmlstarlet at some point.

Not quite what you asked but I do a *ton* of work with CSV exports from
various systems and newline delimited text data. Again, standard UNIX tools
are super useful here, less sed than sort, uniq. I'm starting to get into
Python's csvkit, too.

I dream of all this happening in JSON. The small tools I write for myself
use JSON configuration files. Yaml is pretty, too.

Best,
Eric

On Wed, Oct 29, 2014 at 11:17 AM, [log in to unmask] <
[log in to unmask]> wrote:

> Hardy++
>
> That's what I was going to send!
>
> On Wed, Oct 29, 2014 at 12:02 PM, Brian Zelip <[log in to unmask]> wrote:
>
> > I don't work with metadata for the library, but from metadata class I
> know
> > we (UIUC) use at least MARC, MARCXML, and MODS. Oxygen is a commonly used
> > application around here to process xml.
> >
> >
> > Brian Zelip
> > ---
> > MS Student, Graduate School of Library & Information Science
> > Graduate Assistant, Scholarly Commons
> > University of Illinois at Urbana-Champaign
> > zelip.me
> >
> > On Wed, Oct 29, 2014 at 12:50 PM, P.G. <[log in to unmask]> wrote:
> >
> > > Hello Coders,
> > >
> > > Just wanted to see who works with metadata and what standards and
> > protocols
> > > are you using and what platforms/softwares if any are you using?
> > >
> > > Thank you.
> > > Chris
> > >
> >
>
>
>
> --
> Tod Robbins
> Digital Asset Manager, MLIS
> todrobbins.com | @todrobbins <http://www.twitter.com/#!/todrobbins>
>