Database Reference
In-Depth Information
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8. As a convention, in this topic we capitalize any words we are using as the name of a class.
9. You may also come across the term
taxonomy
; this denotes a controlled vocabulary that
has been structured only into a hierarchy. Whereas with a fully fledged ontology any
relationship can be used, a taxonomy is limited to the “is a kind of” relationship only.
10. In the United Kingdom, this is the term used for a pub that is not tied to one particu-
lar brewery.
11. Very simple RDFS ontologies are often referred to as vocabularies, although in truth
they are strictly more than just vocabularies. Nonetheless, this is what we will refer to
them as in this section as this is how they are commonly known.
12. While it is common practice to exclude the auxiliary verb “has” or “is” from property
names, we prefer to include it (e.g., “has_name,” “is_located_in”) as it enables automatic
translation from a controlled natural language, and it reads better, making the relationship
a bit more explicit, particularly for domain experts not well versed in ontology writing.
13. This type of restriction is known as an inverse functional property and is discussed further
in Chapter 9.
