Grids of grids of simple services

The paper describes how to build systems from service-oriented grids that let you build new grids by composing and adapting existing collections (libraries) of grids. The paper also suggests some best practices for deciding how to architect services and package systems. Often we consider grids as providing seamless access to a set of resources. The author agrees but also proposes that the resulting grid architecture can consist of many small grids. This reflects the many different overlapping community types and resource collections that naturally form individual grids. Each individual grid can have a seamless elegant environment - this even could be a criterion for defining basic grids - but a composite grid would amalgamate multiple subgrids and provide a resultant heterogeneous environment. In other words, we don't want just a few grids but a large number composed, divided, and overlapped to support dynamic communities and requirements.