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Real World XML by Steven Holzner

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Making Statements About the Items in a Container

You can also make statements about each item in a container by using the container's aboutEach attribute. For example, suppose that I want to indicate that each item in a bag has the same creation date. In that case, I could assign the value “creationDate” to the Bag's aboutEach attribute and add a new <rdf:Description> element about "#creationDate", like this:

Listing . ch18_15.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>Mercury</dc:Title>
        <dc:Creator>Nicolas Copernicus</dc:Creator>
        <dc:Subject>
            <rdf:Bag aboutEach="creationDate"> <rdf:li ...

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