To submit a task or set of tasks for execution on a resource or set of resources it is essential that there exist some 
basic common description format. The alternative requires users to learn and track how to describe jobs to execute on 
the many resources in various Grid infrastructures that they may need to access. In this area there is substantial 
adoption, or plan for adoption, of the recently published GGF JSDL specification. Many mappings (such as to Globus or 
Condor) and extensions have been developed for JSDL already..