The following is a summary of the definition of the SBML identifier type
SId
, which defines the permitted syntax of identifiers. We
express the syntax using an extended form of BNF notation:
letter ::= 'a'..'z','A'..'Z'
digit ::= '0'..'9'
idChar ::= letter | digit | '_'
SId ::= ( letter | '_' ) idChar*
The characters (
and )
are used for grouping, the
character *
"zero or more times", and the character
|
indicates logical "or". The equality of SBML identifiers is
determined by an exact character sequence match; i.e., comparisons must be
performed in a case-sensitive manner. In addition, there are a few
conditions for the uniqueness of identifiers in an SBML model. Please
consult the SBML specifications for the exact formulations.