Registry of all libSBML SBML DefinitionURLs.
This class of objects is defined by libSBML only and has no direct
equivalent in terms of SBML components. It is a class used in
the implementation of extra functionality provided by libSBML.
LibSBML provides facilities for transforming and converting SBML documents in various ways. These transformations can involve essentially anything that can be written algorithmically; examples include converting the units of measurement in a model, or converting from one Level+Version combination of SBML to another. DefinitionURLs are implemented as objects derived from the class DefinitionURL.
The DefinitionURL registry, implemented as a singleton object of class DefinitionURLRegistry, maintains a list of known DefinitionURLs and provides methods for discovering them. Callers can use the method DefinitionURLRegistry::getNumDefinitionURLs() to find out how many DefinitionURLs are registered, then use DefinitionURLRegistry::getDefinitionURLByIndex( ) to iterate over each one; alternatively, callers can use DefinitionURLRegistry::getDefinitionURLFor( ) to search for a DefinitionURL having specific properties.