The foaf:isPrimaryTopicOf
property relates something to a document that is
mainly about it.
The foaf:isPrimaryTopicOf
property is inverse functional: for
any document that is the value of this property, there is at most one thing in the world
that is the primary topic of that document. This is useful, as it allows for data
merging, as described in the documentation for its inverse, foaf:primaryTopic
.
foaf:page
is a super-property of foaf:isPrimaryTopicOf
. The change
of terminology between the two property names reflects the utility of 'primaryTopic' and its
inverse when identifying things. Anything that has an isPrimaryTopicOf
relation
to some document X, also has a foaf:page
relationship to it.
Note that foaf:homepage
, is a sub-property of both foaf:page
and
foaf:isPrimaryTopicOf
. The awkwardly named
foaf:isPrimaryTopicOf
is less specific, and can be used with any document
that is primarily about the thing of interest (ie. not just on homepages).