Web Services Composition Methods and Techniques: A Review <s> Shanfeng and Xinhuai et al <s> Automatic composition of semantic Web services by requests is one of difficult problems in the field of Web services. In this paper we investigate Web services ontology and ant colony (AC) algorithm and propose a method of composition of semantic Web services (ACAC) that is based on ant colony algorithm. We generate a graph of input and output of semantic Web services, using this method, and then the composition of Web services is transformed into finding a satisfying path in the graph. So AC algorithm is used for efficient composition of Web services. Finally, we have tested ACAC with a test set and the results show that the algorithm can successfully compose the semantic Web services and is also able to ensure the quality and efficiency of composition. <s> BIB001 </s> Web Services Composition Methods and Techniques: A Review <s> Shanfeng and Xinhuai et al <s> With the development of Internet and information sharing, semantic web attracts many re-searchers' attention in computer field. Web service composition is an important technology in domain of Web service. As integrated solution for realizing the vision of the next generation of the web, semantic web services combine the semantic web technology with web service technology, and thus enable automated discovery, selection, composition and execution of web services. Ontology is the theoretical foundation of semantic web services. Qos ontology of web services description is introduced. In this paper, a new composition algorithm of semantic Web service based on QoS ontology is proposed. Experiments are carried out to compare the new algorithm with some other web service composition algorithms. <s> BIB002
In this process, they compare web service instance with existing web service types by computing their similarity with comparing their semantic descriptions and then they designed a service management system that is a part of their service composition system. Finally according to user's request as input, using AI Planning Engine have generated a suitable composition plan for meet user's request. Van and Zhijian et al BIB002 a new dynamic composition algorithm of semantic web service based on QoS ontology is proposed. Whereof, QoS ontology is an essential component because it provides non-functionality aspects of service. For this reason, they are present a hierarchical QoS ontology QoSHOnt which is consists of three layers: upper, middle and lower. Their algorithm chooses the best service according to the quality of service. BIB001 was asses sed web services ontology and Ant Colony (AC) algorithm. They proposed a method of composition of semantic web services that is based on AC algorithm. Then, they generate a graph of input and output of semantic web services by using this method. Then the composition of web services is transformed into finding a satisfying path in the graph. They focus on the quality and efficiency of composition of web services that is based on users' requests in the field of dynamic composition of web services and OWL-S is used for description of web services and their relationships. This paper proposes an optimal AC algorithm for composition of web services to ensure that the best composition of web services can be gotten in less time.