RDF Rules

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# RDF Rules

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RDF uses Web identifiers (URIs) to identify resources.

RDF describes resources with properties and property values.

## RDF Resource, Property, and Property Value

RDF identifies things using Web identifiers (URIs), and describes resources with properties and property values.

Explanation of Resource, Property, and Property value:

- A Resource is anything that can have a URI, such as "http://www.w3schools.com/rdf"
- A Property is a Resource that has a name, such as "author" or "homepage"
- A Property value is the value of a Property, such as "Jan Egil Refsnes" or "http://www.w3schools.com" (note that a property value can be another resource)

The following RDF document could describe the resource "http://www.w3schools.com/rdf":

<?xml version="1.0"?>
<RDF>
<Description about="http://www.w3schools.com/rdf">
<author>Jan Egil Refsnes</author>
<homepage>http://www.w3schools.com</homepage>
</Description>
</RDF>

| The example above is simplified. Namespaces are omitted.

## RDF Statements

The combination of a Resource, a Property, and a Property value forms a Statement (known as the subject, predicate and object of a Statement).

Let's look at some example statements to get a better understanding:

Statement: "The author of http://www.w3schools.com/rdf is Jan Egil Refsnes".

- The subject of the statement above is: http://www.w3schools.com/rdf
- The predicate is: author
- The object is: Jan Egil Refsnes

Statement: "The homepage of http://www.w3schools.com/rdf is http://www.w3schools.com".

- The subject of the statement above is: http://www.w3schools.com/rdf
- The predicate is: homepage
- The object is: http://www.w3schools.com

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