As the basic unit of description in [RDF](/pages/Resource%20description%20framework.txt), a [triple](/pages/RDF%20triples.txt) states a simple, directed relationship between two resources. Sometimes, we need to describe more detailed circumstances underlying such relationships.

```
<Bob> <is interested in> <the Mona Lisa> .
<Bob's interest> <is a concretization of> <<( <Bob> <is interested in> <the Mona Lisa> )>> .
<Bob's interest> <is an> <Interest> .
<Bob's interest> <since> <4th of October 1998> .
```

The second triple is called a **reifying triple**, and expresses a concretization of the proposition stated by the first triple. The object of a reifying triple is a [triple term](/pages/Triple%20term.txt). It denotes the proposition itself, as a logical, abstract object identified through its constituent subject, predicate, and object components.[^1]

## Footnotes

[^1]: https://www.w3.org/TR/rdf12-primer/