The RDF element used in the SBML format for referring to external
entities is <rdf:Description>
, with a
<rdf:Bag>
element inside of it containing one or
more <rdf:li>
elements. The following template
illustrates the structure:
<rdf:Description rdf:about="#meta id">
HISTORY
<RELATION_ELEMENT>
<rdf:Bag>
<rdf:li rdf:resource="resource URI" />
...
</rdf:Bag>
</RELATION_ELEMENT>
...
</rdf:Description>
In the template above, the placeholder meta id stands for the
element's meta identifier, which is a field available on all SBML
components derived from the SBase base object class. The dotted portions are
optional, and the ellipses ... are placeholders for zero or more elements of the
same form as the immediately preceding element.