SubsystemInclude is correspond to an XInclude.
This patch removes this tag handling and replaces it by the standard
xml inclusion tag.

Signed-off-by: Jules Clero <julesx.clero@intel.com>

Latest patch removes SubsystemInclude tag support. It leads to some
dead code.
This patch removes code which was providing the Folder of the xml file
to include which is now dead.

Signed-off-by: Jules Clero <julesx.clero@intel.com>

Signed-off-by: Jules Clero <julesx.clero@intel.com>

getAttribute API forces the user to call a specific
API for each call getAttributeString etc..
This patch replaces this API by a template one.
The success of of the action can now be checked.
It can be useful one to check that a conversion succeed.

Signed-off-by: Jules Clero <julesx.clero@intel.com>

XML exportation does not validate generated file even if
a schema is provided.
This patch enables the validation of the file at the end
of the export. Moreover, the generated XML is checked against
its schema if one is provided.

Signed-off-by: Jules Clero <julesx.clero@intel.com>

Current serialization implementation require to map the design to
the desired xml files. Thus, xml can't be easily removed and the code is
hard to test.
This patch introduces a serializer, based on the current xmlSerializer
library. This serializer uses an Xml bindings structure which describe
the mapping of the data holder to the desired xml files.

Signed-off-by: Jules Clero <julesx.clero@intel.com>

Current configuration design is mapping classes on xml node.
It leads to some empty classes which contains a node information.
It also leads to inconsistent information retrieval method. Some
can be retrieved through simple getters and some others are retrieved
through child mechanism inherited from Element.
This patch introduces a real configuration object which is a simple
struct. Information retrieval is handled through xml bindings.

Signed-off-by: Jules Clero <julesx.clero@intel.com>

isParsable is never used and the check made through it
can easily be replaced by testing the return value of
getDoc against NULL.

Signed-off-by: Jules Clero <julesx.clero@intel.com>