March 2003
Intermediate to advanced
224 pages
6h 27m
English
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RDF in XML
In preparation for Chapter 6, we need to look at how RDF is written in XML.
The Root Element
In all the examples in this book, I
have given the RDF attributes a prefix of rdf:.
This is not necessary in many RDF documents, but it is the way they
appear in RSS 1.0. For the sake of clarity, we will leave them in
here too. Therefore, for reasons we will discuss in Chapter 6, the root element of an RDF document is:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> . . . </rdf:RDF>
As we will see in Chapter 6, the root element can also contain the URIs of additional RDF vocabularies. In the following examples, we will use elements from the RSS 1.0 vocabulary.
<element rdf:about="URI OF ELEMENT">
The
rdf:about
attribute defines the URI for the
element that contains it. Remember, it is like the subject in a
sentence—everything else refers to it. For example:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns="http://purl.org/rss/1.0/"
>
<channel rdf:about="http://www.example.org/">
. . .
</channel>
</rdf:RDF>means the channel resource is identified by the
URI http://www.example.org/. Or, more to the
point, everything within the
channel
element is referred to by
http://www.example.org.
The contents of the element then describe the object referred to by the URI:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
xmlns="http://purl.org/rss/1.0/" >
<channel rdf:about="http://www.example.org">
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.