What It Is, and Why It's Important
The library community and its allied partners have provided at least one definition for metadata for their respective communities. Here are a couple of examples:
- "A characterization or description documenting the identification, management, nature, use, or location of information resources (data)." [The Society of American Archivists' A Glossary of Archival and Records Terminology]
- "Metadata is structured, encoded data that describe characeristics of information-bearing entities to aid in the identification, discovery, assessment, and management of the described entities." [ALA Task Force on Metadata, 1999]
To meet specific needs of a community or collection, a set of metadata elements (tags) known collectively as a schema is created that will neet the requirements.
Common charactertistics of metadata schemas:
- a limited number of elements
- the name of the element
- the definition of the element
- element's criteria
The University of Alabama Digital Collections are cultural heritage collections. Elements in schemas for cultural heritage materials have broad definitions and criteria so institutions may narrow definitions and set criteria to meet their needs.
Metadata schemas for the cultural heritage items include the CDP Metadata Working Group's [Dublin Core Metadata Best PracticesWestern Best Practices]. Mandatory elements include: title, creator (if available), subject, description, date digital, date orginal (if applicable), format, digitization specifications, resource identifier, and rights management.
With a primary metadata schema in place, other elements may be added to meet the needs of the collection. The elements may be added and/or borrowed from another schema.
Fields unique to our collections include "Donor" and "Funder" mapped to dc.Publisher. These terms are from the MARC relator codes, http://www.loc.gov/marc/relators/relaterm.html
Defintions from MARC Code List: Relator Codes --Term Sequence
- Donor defined as "use for person or organization who is the donor of a book, manuscript, etc., to its present owner. Donors to previous owners are designated as Former owner or Inscriber."
- Funder defined as "use for a person or organization that furnished financial support for the production of the work."
Metadata functions are grouped in three broad types by function. The types may be represented by an element in schema or a schema may be dedicated to the function.
- Descriptive metadata is the most common type of metadata, the one that most people have used. It is data that describes and identifies digital objects whether they were orginally physical artifacts or born digitally. After combining the metadata currently in use for all of our collections, we wound up with an 87-field spreadsheet template: (File:DescriptiveMetadata.xls). We mapped all these fields (File:MASTER LIST for Metadata Fields in CONTENTdm (instructions).docx) to MODS, and we transform each item's metadata to a MODS XML file for both online delivery and long-term storage. The current mapping can be found on the following page, with each spreadsheet column name in place of the contents of that column's field for an item: MODS_Mockup
- Administrative metadata is used to manage and administer. It is an umbrella term for the following:
- Technical metadata provides specifications that describes the generation of the digital object including reformatting history. It is used to manage and migrate digital objects.
- Rights metadata specifies legal access to our end users (see Copyright Guidelines), and digital rights for management of the digital files (see Digital_Services_Permission_Agreement).
- Structural metadata orders records with their images in a flat or hierarchical relationship that is necessary for viewing the material. We're working out how to create METS records from content located where it belongs in our archival storage area, named properly. More on that here: archival_METS
Procedures and Policies for Descriptive Metadata
Metadata_Movement for content being digitized in Digital Services