Solve issue #54 simplify xmlApi

alib2data/src/XmlApi.cpp

alib2data/src/XmlApi.hpp

alib2data/src/alphabet/SymbolToXMLComposer.cpp

alib2data/src/alphabet/SymbolToXMLComposer.h

alib2data/src/automaton/AutomatonToXMLComposer.cpp

alib2data/src/automaton/AutomatonToXMLComposer.h

alib2data/src/container/ContainerToXMLComposer.cpp

alib2data/src/container/ContainerToXMLComposer.hpp

alib2data/src/exception/ExceptionToXMLComposer.cpp

alib2data/src/exception/ExceptionToXMLComposer.h

alib2data/src/factory/XmlDataFactory.hpp

alib2data/src/grammar/GrammarToXMLComposer.cpp

alib2data/src/grammar/GrammarToXMLComposer.h

alib2data/src/label/LabelToXMLComposer.cpp

alib2data/src/label/LabelToXMLComposer.h

alib2data/src/object/ObjectToXMLComposer.cpp

alib2data/src/object/ObjectToXMLComposer.h

alib2data/src/primitive/PrimitiveToXMLComposer.cpp

alib2data/src/primitive/PrimitiveToXMLComposer.h

alib2data/src/regexp/RegExpToXMLComposer.cpp