Creates JythonExceptionDataSource's, which are data sources defined by Jython scripts, but the script need not be in the URI.
include an internal version of the script, so that the data source will work offline, for example when presenting the data source to a group of new users at a conference without network access.
return the URI which would be used for this resource, if it were called directly.
this is the lookup table from URI (*.sps) to script (readTypeSps.jyds)