libSBML Perl API
libSBML 5.10.0 Perl API
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NULL
if no units have been declared.Note that unit declarations for LocalParameter objects are specified in terms of the identifier of a unit (e.g., using setUnits()), but this method returns a UnitDefinition object, not a unit identifier. It does this by constructing an appropriate UnitDefinition. For SBML Level 2 models, it will do this even when the value of the "units" attribute is one of the predefined SBML units "substance"
, "volume"
, "area"
, "length"
or "time"
. Callers may find this useful in conjunction with the helper methods provided by the UnitDefinition class for comparing different UnitDefinition objects.