Metadata and Meta tag

What is metadata?What does metadata do?Metadata schemesWhat is meta tag?Meta tag example

Table of Content

- Metadata is commonly referred to as “data about data” or “information about information”

- It is structured information that describes, explains, locates, or makes it easier to retrieve, use, or manage an information resource

- Some use it to refer to machine understandable information, others use it only for records that describe electronic resources

What is metadata

- Librarians equate it with a complete bibliographic record- Information technologists equate it to database schema or definitions of the data elements- Archivists include context information, restrictions and access terms, index terms, etc.

What is metadata

What is metadata• Metadata does not have to be digital• Metadata relates to more than the description of an

object. • Metadata can come from a variety of sources• Metadata continue to accrue during the life of an

information object or system. • One information object's metadata can

simultaneously be another information object's data.

Descriptive metadata-describes a resource for purposes such as discovery and identification. It can include elements such as title, abstract, author, and keywordsStructural metadata-indicates how compound objects are put together. For instance, pages are ordered to form chaptersAdministrative metadata-provides information to help manage a resource, such as when and how it was created, file type, and other technical information, and who can access it

What is metadata-types

Resource discovery

- Allow resources to be found by relevant criteria- Identify resources- Bring similar resources together- Distinguish dissimilar resources- Give location information

What does metadata do?

Organizing electronic resources

- As Web based resources grow, aggregate sites or portals are useful in organizing links to resources based on audience or topic

What does metadata do?

Interoperability

- Ability of multiple systems with different hardware and software platforms, data structures, and interfaces to exchange data with minimal loss of content and functionality- network can be searches more seamlessly

What does metadata do?

Digital Identification

- Include elements such as standard numbers to uniquely identify the work or object to which the metadata refers to.

What does metadata do?

Archiving and Preservation

- Key to ensure that resources will survive and continue to be accessible into the future- Track the lineage of digital object to detail its physical characteristics, and to documents its behavior in order to emulate it on future technologies.

What does metadata do?

Metadata Schemes• Identify the purpose of the metadata model• Level of specificity of the elements• Identify resources• Infrastructure - who will supply it?• What type of information package is it?• Who will use the metadata?

Metadata Schemes-Dublin Core• Metadata to improve information retrieval of

internet resources• Developed predominantly by the bibliographic

community. Elements similar to bibliographic surrogate

• Known for simplicity, semantic interoperability, international consensus, extensibility, metadata modularity on the Web

Metadata Schemes-Dublin Core

Metadata Schemes-MODS• Stands for metadata object description

schema (MODS)• Rich description of electronic resources• Use of XML Schema language such as use of

optional ID attribute to facilitate linking at the element level

• Ability to embed a rich description of components in the related item element

Metadata Schemes-MODS

Metadata Schemes-Others• Text Encoding Initiative (TEI)• Metadata Encoding and Transmission

Standard (METS)• Encoded Archival Description (EAD)• Learning Object Metadata (LOM)• MPEG Multimedia Metadata

Metadata Schemes-Integration• How can interoperability be ensured with so

many metadata standards?For instance, Resource Description

Framework (RDF) developed by World Wide Web Consortium (W3C) is data model to integrate multiple metadata schemes

Elements from different schemes to be combines in single resource description

Metadata Schemes

What is meta tag?• Metadata of Webpage• Provides search engines with information

about sites.• Provide information to all sorts of clients and

each system processes only the meta tags they understand and ignores the test.

• HTML codes that are inserted into the header on a web page after the title tag

• In SEO, it refers to meta description tag and the meta keywords tag

What is meta tag?

Meta tag example

Google uses description tag instead of keyword tag in web search ranking

Questions

ResourcesDefinitionshttp://www.nisopress.org/publications/press

Dublin Corehttp://www.dublincore.org/MODShttp://www.loc/gov/standards/mods/TEIhttp://www.tei-c.org/METShttp://www.loc/gov/standards/mets/EADhttp://www.loc.gov/ead

LOMhttp://ltsc.ieee.org/wg12RDFhttp://www.w3.org/RDF/