How to exploit domain knowledge in Multiple Software Product Lines?

As Software Product Lines (SPL) are inevitably moving towards a multiple form to tackle issues of reuse and complexity, variability management across the composed SPLs is still addressed with basic inter-constraints. Based on two disjoint case studies (digital signage and cloud computing), we identified this challenging problem for the SPL community. In this paper we describe how the domain knowledge needs to be exploited to support a more complete definition of Multiple Software Product Lines (MSPL). Such an exploitation implies the definition of a domain-driven definition of configuration and an order independent configuration process.