Ryan - Sorry, no, we do not have an XSD which defines the schema for the XML being created when you export a GeoEvent Processor configuration.
There should be no "other" attributes or elements. When GEP exports a configuration, the XML should have everything; if there is no value for a particular property then that tag is supposed to be ouput as an empty tag.
Are you developing a custom adaptor, transport (or both) as well as a custom connector? Are you able to export your developed components as an XML configuration ... and want to verify that your export has all of the properties?
/RJ