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عدد المساهمات : 36
تاريخ التسجيل : 04/05/2011
 | موضوع: Metadata----  الإثنين يونيو 20, 2011 12:04 pm | |
| Definition
Most common: “data about data"
"Metadata is a short summary of characteristics of each available resource " (wood 1997)
"Metadata is machine understandable information about web resources or other things" (Berners-Lee 1997)
“Metadata is structured information that describes, locates. or otherwise makes it easier to retrieve, use or mange an information resource" (Hodge 2001)
(Example (Dublin Core
<head profile="http://dublincore.org"> <title> … </title> <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/" /> <link rel="schema.DCTERMS" href="http://purl.org/dc/terms/" /> <meta name="DC.Identifier" schema="DCterms:URI" content="http://tutorialsonline.info/Common/DublinCore.html" />
<meta name="DC.Format" schema="DCterms:IMT" content="text/html" /> <meta name="DC.Title" xml:lang="EN" content="Dublin Core Tutorial" /> <meta name="DC.Creator" content="Alan Kelsey" /> <meta name="DC.Subject" xml:lang="EN" content="Dublin Core Meta Tags" /> <meta name="DC.Publisher" content="Alan Kelsey, Ltd." /> <meta name="DC.Publisher.Address" content="alan@tutorialsonline.info" /> <meta name="DC.Contributor" content="Alan Kelsey" /> <meta name="DC.Date" scheme="ISO8601" content="2007-01-06" /> <meta name="DC.Type" content="text/html" /> <meta name="DC.Description" xml:lang="EN" content="Learning Advanced Web Design can be fun and easy! Look at a site designed specifically to help you learn how to design web pages with proper tags, styles, and scripting." />
<meta name="DC.Identifier" content="http://tutorialsonline.info/Common/DublinCore.html" /> <meta name="DC.Relation" content="TutorialOnline.info" scheme="IsPartOf" /> <meta name="DC.Coverage" content="Hennepin Technical College" /> <meta name="DC.Rights" content="Copyright 2007, Alan Kelsey, Ltd. All rights reserved." /> <meta name="DC.Date.X-MetadataLastModified" scheme="ISO8601" content="2007-01-06" /> <meta name="DC.Language" scheme="dcterms:RFC1766" content="EN" />
Example (MARC)
LDR 01581cam 22003011 4500
001 287728
005 19990402153426.4
008 711115s1968 nju b 000 0 eng
035 _9 (DLC) 68027488
010 _a 68027488
040 _a DLC
_c DLC
_d DLC
050 00 _a PR1585
_b .F7
082 00 _a 829/.3
100 1 _a Fry, Donald K.,
_e comp.
245 14 _a The Beowulf poet;
_b a collection of critical essays,
_c edited by Donald K. Fry.
260 _a Englewood Cliffs, N.J.,
_b Prentice-Hall
_c [1968]
300 _a xi, 177 p.
_c 21 cm.
350 _a $4.95
490 0 _a Twentieth century views
490 0 _a A Spectrum book.
630 0 _a Beowulf.
650 0 _a Epic poetry, English (Old)
_x History and criticism.
650 0 _a Monsters in literature.
650 0 _a Dragons in literature.
650 0 _a Heroes in literature.
991 _b c-GenColl
Metadata Goals
To summarize the meaning of the data (i.e., What is the resource about?).
To allow users to search and find the resource.
To allow users to determine if the resource is what they want.
To give contact information about the recourse, such as owner.
To prevent some users (e.g., Children) from accessing the resource.
To retrieve and use a copy of the data (i. e., where do I go .to get the resource)
To instruct how to interprets the recourse.(E.G., Format, .encoding, encryption)
To help decide which instance of the recourse should be retrieved (if there is multiple formats).
To give information that affects the use of the recourse, such as legal conditions on use, its size, or age
Some Facts About Metadata
Metadata does not have to be digital.
Metadata relates to more than description of a recourse (some elements are used for processing, and management purposes (file size, format, restrictions, linking … etc.
Metadata can come from a variety of sources (creator, publisher, information professionals)
Some elements of metadata can be created automatically by some algorithm or through some relationship to another recourse (links).
Metadata can changed or modified or even disposed during the life of a recourse.
Metadata Types
Descriptive metadata:- 1
Used to describe and identify the information recourse.
2 -Structural metadata:
Information related to the structure of the information recourse.
3 -Administrative metadata:
Used in management of the recourse.
Encoding Metadata
Since it is machine understandable (readable) information it should takes the form of tags .or markers that help identify all kinds of information
A metadata record consist of a set of attributes or elements necessary to describe the recourse in question.
.We need an encoding format to carry metadata such as (HTML, XML, MARC… etc.) | |
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