Domain-driven design (DDD) is commonly used with microservices architecture (MSA) to develop scalable, business-driven service-based software. Layered, tree-based architectures have recently been mentioned for MSA to tame the system complexity. However, there exists a knowledge gap in terms of the exact nature of this architecture style and how it is constructed. In this paper, we propose a nested, multitree microservices architecture (named TMSA) to fill this gap. We define TMSA based on a module-based RESTful DDD software architecture. A service is composed of a nested service tree. Service structure reuse is inherently supported by the multitree. The multitree structure also provides a scaffolding on which to define two types of service resiliency and two architecture reconfiguration operations. To construct TMSA directly in OOPLs, we propose an annotation-based specification language, named TASL. We modularly define TASL based on an existing specification language. We implement TMSA as part of a DDD software framework, named JDA.