Why libSBML cannot import gene identifiers in <fbc:listOfGeneProducts> and regulation rules

Question

[hohokyo]

Hi all,

I used libSBML to import the BiGG model "e_coli_core.xml" to Matlab. The gene identifiers' information such as UniProt IDs and regulation rules are missing in the imported model but could be found in the xml file.

Why is this? Here's a warning information.

2: (99108) Warning Every SBML Level 3 package is identified uniquely by an XML namespace URI and defines the attribute named 'required'. LibSBML has detected what appears to be an SBML Level 3 package with required=false but this instance of libSBML-5 cannot find the code necessary to parse this information.
Package 'fbc' is not a required package. The information relating to 'fbc' will be saved but cannot be interpreted."

Thanks!

Han