Date post: | 10-Jul-2015 |
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M.l.i.sc 3rd sem
Central university of Gujarat
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What is standards
Why use existing standards
what is Metadata
Why is Metadata Important
Types of metadata
Examples of metadata standards
dublin core ,MARC ,EAD ,MODS ,RDF
MITS.
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A standard is a document that provides
requirements, specifications, guidelines or
characteristics that can be used consistently
to ensure that materials, products, processes
and services are fit for their purpose.
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Cost saving
Access to help and advice
Usability
Resource discovery
Sustainability
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―Data about data‖
a set of data that describes and gives information
about other data.
Metadata answer who, what, when, where,
why, and how about every facet of the data
that are being documented
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Increased accessibility
Ability for different systems to talk to one
another
Expanding use
Multi-versioning
Preservation
Cost considerations
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5 types of metadata:
Descriptive – Title, author, topic, etc.
Administrative – Record number, record date, etc.
Technical – File size, software needed, etc.
Rights – Copyright ownership, etc.
Management – typically by/for owning agency
(Price paid, circulation restrictions, etc.)
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MARC21 Formats--Representation and communication of descriptive metadata about information items
ISO 2709-based metadata communications protocol
International standard (maintained by LC)
Well-maintained, mature standard
Widely adopted by library communities
Field/record size limitations
No ability to embed related objects (e.g. book cover GIF)
Limited ability to convey hierarchical/complex relationships
Narrow focus on cataloging
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MODS (Metadata Object Description Standard)—XML markup language for selected data from MARC21 records as well as original resource description
Richer than Dublin Core; library-oriented XML metadata schema
Can accommodate AACR2 standards
Maintenance agency: Library of Congress
Well-suited as a metadata format for OAI harvesting
MARC21 readily converts to MODS; however, cannot readily do a reverse conversion of MODS to MARC21
Community best practice guidelines would enhance usefulness
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EAD (Encoded Archival Description)—XML markup design for encoded finding aids using Standard Generalized Markup Language
EAD header carries metadata for finding aid
Standard maintained by LC along with SAA
suited for archival description
Provides simple or complex mark-up design to support varying levels of indexing
Needs help at the item level
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Dublin Core – Metadata element set (for description of digital objects)
Maintenance agency: Dublin Core Metadata Initiative (DCMI) hosted by OCLC Research
Achieve international standardization (ISO 15836)
Intended for use by both non-catalogers and specialists
No MARC tags used with Dublin Core metadata
Worldwide adoption (DCMES translated into 20+ languages)
No consistency across different projects using Dublin Core
Documentation for Dublin Core not well-defined
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Metadata Encoding and Transmission Standard (METS)
A standard ―shell‖ for encoding data essential for retrieving, preserving, and serving up digital resources
Six modules define descriptive, administrative, structural, rights and other metadata
Some parts of a METS object may be external (e.g., a MODS record for the descriptive metadata)
Maintenance agency: Library of Congress
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Resource Description Format (RDF)
RDF provides interoperability between applications that exchange machine-understandable information on the Web
Designed to convey metadata for machine consumption (raw RDF is not very human-readable)
A subject of debate (typically RDF vs. XML)!
Fundamental building block of RDF is the triple (subject + predicate + object)
Maintained by the W3C; RDF specification under revision
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Thank You !!!