RDF model: triples triples triples

RDF triples are like sentences, composed of subject, predicate and object. The RDF triples are sometimes also known as resource, property, value triples.

So, informally a triple can be as follows, corresponding to the concept that "temperature is of type parameter":

Example 1: An Informal Triple

Triple Part Our Example
Subject temperature
Predicate is of type
Object parameter

In this case, temperature is the subject, is of type is the predicate and parameter is the object.

But the story does not end there. Formally, the subject and predicate must be a Uniform Resource Identifier, or URI (the object could be anything). A URI can be, for example, a URL (Uniform Resource Locator), like what you type in the browser to request a web page. So a more correct version of the previous triple is:

Example 2: A Formal Triple

Triple Part Our Example
Subject http://marinemetadata.org/2005/03/voc#temperature
Predicate http://www.w3.org/1999/02/22-rdf-syntax-ns#type
Object http://marinemetadata.org/2005/03/voc#parameter