Problem with Object property data query

Hello,

I have a problem when i use data.query.events to query some vmware object data in flex.

Before i send this query, i need to know what property this object have, like i want get all Datastore object name i need make a property is "name" in propertyspec.

If i want query other properties in Datastore object like datastore "type" , how could i know what properties this object provided? Is it has any doc for object and their properties relation? 

Thanks.