An Export instance represents information about the type of data that Smooks can produce/export.
An Export instance must have a 'type' which is the class type of Smooks produces when filtering.
An Export can optionally have a name which is simply used as an identifier so that the calling
process can easliy identify this export
An Export may also optionally have an 'extract' attribute which can be used when only a sub-part
of the data is to be considered for exporting.
For example, this could be used to specify that the calling process is only interested in a specific object instance
in a
JavaResult