Mapping out the challenges and strategies for the widespread adoption of service computing.

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Abstract-Digital Ecosystem (DE) is comprised of heterogeneous and distributed species which can play the dual role of service provider and service requester. Today DE lacks semantic search support, which means that it cannot provide a reliable and trustworthy link between service providers and service requesters. To solve this issue, we design a conceptual framework of a service-ontology-based semantic service search engine. Apart from the function of service search with a novel search model, this framework also provides a quality-of-services (QoS)-based service evaluation and ranking methodology. To evaluate the feasibility of our framework, we implement a prototype in the transport service domain, and compare the performance of the search model with three traditional information retrieval models. The conclusion to this evaluation and suggestions for future works are provided in the final section.Index Terms-Digital Ecosystems, QoS ranking, semantic service search, service evaluation I. INTRODUCTION IGITAL Ecosystem (DE) is defined as "an open, loosely coupled, domain-clustered, demand-driven, selforganizing and agent-based environment, in which eachspecies is proactive and responsive for its own benefit and profit" [6], which is a neoteric terminology whose emergence is a result of the natural existence of the business ecosystem, along with the evolution of business network and information technology. The goal of DE is to improve the efficiency of the communication between internal agents, and to structuralize the existing business ecosystem [18]. The contemporary DE researches focus on theoretical study and application development [9]. DE is composed of two basic elements: species and environments [6]. Species are mainly categorized into three types: biological species, economic species and digital species. Species can play two different roles in DE, as a service requester (client) that needs services, and as a service provider (server) that provides services. Moreover, a given species can be both a service requester and a service

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