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I need to connect different kinds of online resource to my metadata

Overview

As the World Wide Web has developed into a ubiquitous information source, links to on-line information and services have become a critical element in all metadata records. As URLs have increased in complexity, it has become more important to provide supporting information along with the links. The ISO Standards use CI_OnlineResources to describe links. These include a rich set of attributes for describing on-line resources.

Structure

The structure of the CI_OnlineResource is shown here as Unified Modeling Language. The only required field is linkage, the URL for the resource. There are five optional elements, each of which can occur just once, that provide more information about the resource that the URL links to. The function, name, and description can provide information to the user about what will happen when they click the link. The function and protocol can be used to classify the link in several ways and the applicationProfile can be used to provide information about applications that might be able to use the link automatically.

The name, description, and function attributes can be used to display helpful information along with the link. For example, the CI_OnlineResource shown below as XML can be displayed as:

XML

<gmd:CI_OnlineResource>
    <gmd:linkage>
        <gmd:URL>http://www.ngdc.noaa.gov/hazardimages/</gmd:URL>
    </gmd:linkage>
    <gmd:protocol>
        <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
    </gmd:protocol>
    <gmd:applicationProfile>
        <gco:CharacterString>Web Browser</gco:CharacterString>
    </gmd:applicationProfile>
    <gmd:name>
        <gco:CharacterString>NGDC Natural Hazards Image Database</gco:CharacterString>
    </gmd:name>
    <gmd:description>
        <gco:CharacterString>NGDC maintains a collection of geologic hazards photographs,
            many of which are available as 35mm slide sets, as digital images
            on CD-ROM or on-line. Each slide set consists of 20 slides in color
            and/or black and white along with a separate booklet of
            captions.
        </gco:CharacterString>
    </gmd:description>
    <gmd:function>
        <gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
        codeListValue="information">information</gmd:CI_OnLineFunctionCode>
    </gmd:function>
</gmd:CI_OnlineResource>
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