There is a strong need to be able to schedule grid jobs based off of things like Architecture and Operating system.  
There are also classes of jobs that do not need to be unnecessarily constrained to one particular set of resources.  
Relying solely on the tools provided in JSDL 1.0 can potentially eliminate sets of valid resources.  To that end, we 
would like the ability to relay the information necessary to indicate that jobs can run on any of a set of valid 
resources.

Some usage examples are:
-  Requesting to run a Java program on any machine type that supports Mac OS X or Linux,
-  Requesting to run an R program for which the architecture is 32-bit and either Windows or Mac OS X,
-  Requesting to run an arbitrary executable from a set of pre-compiled binaries.  Only one of them will be staged in 
depending on the capabilities of the computing resource ( for example 32-bit windows machines with 2 G of available RAM,
 or 64-bit windows machines with 4 G of RAM).

The members of the JSDL WG should study the feasibility, the syntax and the semantics of the OR relational operator for 
requirements in JSDL.