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Real World XML by Steven Holzner

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Making Statements About Containers

You can use a container's ID attribute to make a statement about the container as a whole, separate from the items in the container. Here's an example: In this case, I'm giving a creation date for a Bag container. To do that, I give the Bag container the ID “planets" and then create a new <rdf:Description> element about "#planets" to describe the Bag container and give its date:

Listing . ch18_14.rdf
 
<?xml version="1.0" ?>
<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:dc="http://www.purl.org/DC#">

    <rdf:Description
        about="http://www.starpowder.com/planets.html">
        <dc:Title>XML Links</dc:Title>
        <dc:Creator>Nicolas Copernicus</dc:Creator>
        <dc:Subject>
            <rdf:Bag ID="planets"> <rdf:li rdf:resource="http://www.starpowder.com/mercury.html"/> ...

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