Is it expected that a reader of this quickstart would know what a "drl resource" is? I guess we can't explain every detail, and we do need to assume some prior knowledge. Maybe we could clarify this in parentheses? Something like: 

    The drl resource (drools rule file) is specified...

I'm not sure on the right terminology for describing what a "drl resource" is, but hopefully this gives you an idea of what I'm thinking.