[glue-wg] Publishing "exchange rates" using GLUE

Hi, In the NGS we have a requirement for a mechanism whereby users can be "charged" different rates when using a resource, depending on which VO they are a member of. By charged I don't mean in monetary terms, but rather in time. So for example using 1 hour of a resource with exchange rate 1 is accounted as one hour of usage for that resource; using an hour of a resource with exchange rate 2 is accounted as 2 hours etc. Such a system will allow resource providers to prioritize usage for different VOs. Does anyone use such a system using GLUE to publish exchange rate information? If necessary we can formulate this requirement into a use case for GLUE 2.0 Matt