XML File Format: Serialized Models and Solutions

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XML File Format: Serialized Models and Solutions

Concert Technology for C++ users offers a suite of classes for serializing ILOG CPLEX models (that is, instances of IloModel) and solutions (that is, instances of IloSolution) through XML. The ILOG CPLEX C++ API Reference Manual documents the XML serialization API in the group optim.concert.xml. That group includes these classes:

IloXmlContext allows you to serialize an instance of IloModel or IloSolution. This class offers methods for reading and writing a model, a solution, or both a model and a solution together. There are examples of how to use this class in the reference manual.
IloXmlInfo offers methods that enable you to validate the XML serialization of elements, such as numeric arrays, integer arrays, variables, and other extractables from your model or solution.
IloXmlReader creates a reader in an environment (that is, in an instance of IloEnv). This class offers methods to check runtime type information (RTTI), to recognize hierarchic relations between objects, and to access attributes of objects in your model or solution.
IloXmlWriter creates a writer in an environment (that is, in an instance of IloEnv). This class offers methods to access elements and to convert their types as needed in order to serialize elements of your model or solution.

Note

There is a fundamental difference between writing an XML file of a model and writing an LP/MPS/SAV file of the same extracted model. If the model contains piecewise linear elements (PWL), or other nonlinear features, the XML file will represent the model as such. In contrast, the LP/MPS/SAV file will represent only the transformed model. That transformed model obscures these nonlinear features because of the automatic transformation that took place.

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