RDF rules

RDF uses web identifiers (URIs) to identify resources.

RDF uses attributes and attribute values ​​to describe resources.

RDF Resources, Properties, and Property Values

RDF uses web identifiers to identify things and describes resources through properties and property values.

Explanation of resources, attributes and attribute values:

• A resource is anything that can have a URI, such as "http://www .php.cn/rdf"

• Attribute is a resource with a name, such as "author" or "homepage"

• Attribute value is the value of a certain attribute, such as "David" or "http://www.php.cn" (please note that an attribute value can be another resource)

The following RDF document can describe the resource "http://www.php.cn/rdf":

The above is a simplified example. Namespace is ignored.

RDF Statement

The combination of resources, attributes, and attribute values ​​forms a statement (called the statement's body,Predicate and Object).

Please look at some specific examples of statements to deepen your understanding:

Statement: "The author of http://www.php.cn/rdf is David."

• The subject of the statement is: http://www.php.cn/rdf

• The predicate is: author

• Object is: David

Statement: "The homepage of http://www.php.cn/rdf is http://www.php.cn".

• The subject of the statement is: http://www.php.cn/rdf

• The predicate is: homepage

• The object is: http://www.php.cn