RDF (Resource Description Framework) [14, 17] is essentially a data model. There are various ways in capturing knowledge with RDF, e.g.,
as natural language sentence, in a simple triple notation called N3,
in RDF/XML serialization format,
and by a graph of the triples [18].
RDF’s modeling primitive is an object-attribute-value triple, which is called a statement. For example, the sentence medicinal learning objects “New warnings of using pain drugs in topical use with children” d eals “Pain drugs for topical use is a natural language sentence that can be presented by RDF. In Figure 3 it is presented in RDF/XML serialization format.
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