What's the correct way to reference "time" in an SBML model? The example 'discontinuityTimeAndDelays-time-l2.xml' in the semantic-test-suite uses:
<csymbol encoding="text" definitionURL="http://www.sbml.org/symbols/time">
time
</csymbol>
but this syntax causes the following error in the online validator:
Error Line 23 Column 89: Datatype error: Type:InvalidDatatypeValueException, Message:Value 'http://www.sbml.org/symbols/time' is not in enumeration .
<csymbol encoding="text" definitionURL="http://www.sbml.org/symbols/time">