关键词：堆；软件；云架构；云计算
摘 要：By changing how business and society run, cloud computing is opening up huge avenues ofinnovation. Developers are now combining systems of record with systems of engagement,and a new style of cloud-based application is emerging: systems of interaction. For theseapplications to be sustainable, cloud computing needs to be built on open source and openstandards. This article lays the groundwork.