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History and Definition of Metadata
– Metadata has been used in traditional card catalogs in libraries.
– Metadata can come in different layers, such as physical records and digital records.
– Metadata serves purposes like helping users find relevant information and organizing electronic resources.
– Metadata of telecommunication activities is collected for traffic analysis and mass surveillance.
– Libraries converted their catalog data to digital databases in the 1980s.
– Metadata means data about data.
– Metadata provides information about aspects of the data.
– Examples of metadata include the purpose, time and date of creation, and source of the data.
– Metadata can be stored and managed in a metadata registry or repository.
– Context is necessary to identify metadata.

Types and Purpose of Metadata
– Structural metadata describes the structure of database objects.
– Guide metadata helps humans find specific items through keywords.
– There are three categories of metadata: technical, business, and process metadata.
– Metadata models exist to specify different types of metadata.
– Specialized metadata standards exist for different disciplines.
– Metadata helps users access resources by relevant criteria and location information.
– Metadata allows resources to be found, identified, and organized.
– Metadata can distinguish between similar and dissimilar resources.
– Metadata aids in the discovery and preservation of resources.
– Metadata improves the user experience and facilitates finding information online.

Usage and Standards of Metadata
– Metadata is used in various domains, including libraries, telecommunications, and government organizations.
– Metadata is used for traffic analysis and surveillance.
– Metadata standards exist for different disciplines and types of data.
– Metadata enhances the usefulness of digital content, such as web pages and digital images.
– Metadata can include information about musicians, singers, and songwriters on CDs.
– International standards apply to metadata, with work being done by ANSI and ISO.
– The core metadata registry standard is ISO/IEC 11179 Metadata Registries (MDR).
– ISO/IEC 11179-1:2004 provides the framework for the MDR standard.
– ISO/IEC 11179-3:2013 extends the MDR to support the registration of Concept Systems.
– A new edition of ISO/IEC 11179-1 is expected to be published in 2015 or early 2016.

Metadata Structures and Schemata
– Metadata is structured using standardized concepts and schemes.
– Controlled vocabularies, taxonomies, and metadata registries provide further standardization.
– Structural metadata is important in data model development and database design.
– Metadata syntax varies depending on the markup or programming language used.
– Metadata elements can be assembled into metacontent statements using vocabularies.
– Metadata schemata can be hierarchical, with parent-child relationships between elements.
– Schemata can also be linear, where elements are classified along one dimension.
– Planar schemata classify elements along two orthogonal dimensions.
– Examples of hierarchical and linear schemata are the IEEE LOM and Dublin Core.
– Hypermapping is required when metadata schemata exceed planar depiction.

Specific Applications of Metadata
– Statistical data repositories have specific requirements for metadata.
– Metadata describes the source, quality, and statistical processes used to create the data.
– Metadata validation and improvement are important for the statistical community.
– Metadata helps identify resources suitable for users with specific needs.
– More work is needed to incorporate accessibility metadata into established schemas.
– Geospatial community has specialized geospatial metadata standards.
– Formal metadata is essential for geospatial data.
– Geospatial metadata builds on traditions of map- and image-libraries and catalogs.
– Common text-processing approaches are not applicable for geospatial data.
– Geospatial metadata documents characteristics and attributes of geographic data.
Dublin Core metadata terms are used for resource discovery.
– The original set of 15 classic metadata terms are endorsed in several standards documents.
– Metadata can be written into digital photo files to identify ownership, copyright, and contact information.
– Metadata helps in organizing and searching photos on computers and the Internet.
– Metadata is particularly useful in video for efficient search and analysis.
– Operational metadata provides information about the content produced and its characteristics.
– Human-authored metadata improves search engine visibility and audience engagement.
– Standardization and harmonization work benefits industry efforts to build metadata systems.
– European Statistics Code of Practice provides guidelines for managing statistical data and metadata.
– Metadata helps catalog and locate library items in both digital and analog formats.
– US Census Bureau uses the Long Form to collect information.
– Metadata collection is an essential part of the census process.
– Metadata guidelines and standards improve efficiency in managing statistical business processes.
– Metadata is used to classify and identify items in libraries.
– Metadata plays a crucial role in organizing library collections.

Merriam-Webster Online Dictionary
metadata (noun plural but singular or plural in construction)
data that provides information about other data
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