Implementing Effective Metadata Brian Lavoie Office of Research OCLC Online Computer Library Center, Inc. Intranets 99, San Francisco April 27, 1999.

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Presentation transcript:

Implementing Effective Metadata Brian Lavoie Office of Research OCLC Online Computer Library Center, Inc. Intranets 99, San Francisco April 27, 1999

Roadmap I.Metadata for Networked Resources II. Implementing Metadata in HTML Documents III.Metadata Element Sets IV.The Dublin Core: Overview and Implementation in HTML V.Summary

Metadata Data that provides information about a resource –to manage information collections –to facilitate resource discovery Can be created for information resources of any kind, in any medium … for example: –Books: bibliographic data in a card catalog –Computer programs: comments in source code

Metadata for Networked Resources Why metadata? Problem: Rapid growth in networked resources leads to increasingly chaotic information collections. –As size and scope of collection expands, simple keyword indexing becomes less effective. Solution: Need metadata framework that: –enables richer description than keyword indexing. –is usable by content managers who are not necessarily resource description specialists. –is simple and inexpensive to implement.

HTML (Hypertext Markup Language) Tag-based markup language for structured, hyperlinked documents My Document A Sample HTML Document Click here

Implementing Metadata in HTML Documents The META tag: Container for embedded resource description Name Attribute = property or characteristic of a resource (e.g., title, author, keywords) Content Attribute = specific value of a property (e.g., War and Peace, Leo Tolstoy, Russian literature)

META Tag Usage: Example <META name=keywords content=intranet, intranets, knowledge management, knowledge worker, knowledge workers, information professional, information professionals> <META name=description content=Intranets 99 Conference> HTML Document

The META Tag and Search Engines Enter: +intranets +information professionals into AltaVista search engine … returns: Intranets 99 Intranets '99 Conference URL: Last modified 17-Dec-98 - page size 5K - in English [Translate]

Inconsistency Across Name Attribute Values <META NAME=KEY WORDS … <META NAME=KEYPHRASES … <META NAME=KEYS … <META NAME=KEYWORD … <META NAME=KEYWORDS …

Inconsistency Across Content Attribute Values <META NAME="AUTHOR … … CONTENT="OAKWOOD DESIGN"> … CONTENT="JJR ENTERPRISES - … CONTENT="TIM SCHAEFER, COPYRIGHT 1997, 1998 ALL RIGHTS RESERVED"> … CONTENT="RWM "> … CONTENT="CLOTHING">

The META Tag: Pros and Cons PROS... Useful container for embedded resource description. Easily adapted for use by automated document management or search/retrieval applications. CONS... No guidelines on how to fill out the tag. Prone to inconsistency and misusage. Need to supplement the META tag with a more structured approach to the metadata itself...

Metadata Element Sets A set of descriptive elements with well- defined interpretations (semantics) that collectively form a description of a resource. Eliminates inconsistencies and enhances the usefulness of metadata in managing and locating resources, by describing resources in a standard, consistent way.

The Dublin Core Metadata Initiative Metadata element set intended to facilitate description and discovery of electronic resources. Usable by non-experts, as well as resource description specialists. Extensible, for richer resource descriptions. Development has benefited from participation of an international cross-section of communities: libraries, museums, government agencies, corporations...

The 15 Dublin Core Metadata Elements TitleAuthor or Creator Subject and KeywordsDescription PublisherOther Contributor DateResource Type FormatResource Identifier SourceLanguage RelationCoverage Rights Management

Implementing Dublin Core: The META Tag Revisited HTML Metadata Container:...

Extending the Dublin Core Sometimes more detailed description of a resource is needed than the 15 core elements can provide. Dublin Core can be extended with qualifiers:

More Ways to Clarify Metadata

Metadata in Action:

Gilder Lehrman Exhibition Calendar

Embedded Metadata

Derived Metadata Record Title:Exhibitions Calendar of Gilder Lehrman Documents Creator:Paul Romaine Subject:Calendar, exhibitions in New York,... Description:Calendar of exhibitions, principally in New York... Publisher:The Gilder Lehrman Collection Contributor:Robert Parks Date: Type:Bibliography Format:text/html Identifier: Language:English

Summary: Implementing Effective Metadata Implementing Metadata: META tag provides framework for deploying metadata as embedded resource description in HTML documents. Implementing Effective Metadata: Use a well-defined metadata element set. Dublin Core offers rich description; usable by description experts and non-experts; simple and inexpensive to implement. Clarify potentially ambiguous metadata with LINK tag and scheme attribute.

For More Information... META Tag: Metadata: Dublin Core: