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Why is Level 1 still being kept around if Level 2 exists?

April 26, 2017exists kept level

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Why is Level 1 still being kept around if Level 2 exists?

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There exist tools that either were developed before the creation of SBML Level 2 or for which Level 1 is more appropriate. SBML Level 1 therefore continues to have relevance even with the existence of Level 2. Note that since all Level 1 models can be translated to SBML Level 2, tools that read SBML Level 2 can be made to support Level 1 reasonably easily. Moreover, the availability of libSBML makes it much easier for application developers to support different SBML levels in software applications. Among other features, libSBML has a built-in Level 1 to Level 2 translation facility.