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Erschienen in:
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2015 | OriginalPaper | Buchkapitel

5. Service Semantics

verfasst von : Steffen Stadtmüller, Jorge Cardoso, Martin Junghans

Erschienen in: Fundamentals of Service Systems

Verlag: Springer International Publishing

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Abstract

The chapter looks at how to enrich the description of cloud services with semantic knowledge. This enrichment is conducted using Linked USDL (Unified Service Description Language), a service description language built with semantic web technologies. Linked USDL provides a business and technical envelope to describe services’ general information and their Web API. This improves the search and contracting of services over the web. Using the LastFM cloud service as a starting point, the chapter delves into semantic description and explains the development of a Web API build using the REST paradigm to access cloud services pragmatically.

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4
Compare to the collection resources of a REST architecture introduced in Sect. 5.2.2.
 
5
Protégé ontology editor and knowledge-base frameworkhttp://​www.​protege.​stanford.​edu.
 
10
See IETF RFC7230 athttp://​tools.​ietf.​org/​html/​rfc7230 et seq. for details.
 
13
The HTTP POST method is a noteworthy exception as it permits the submission of data to process, which is similar to an RPC call and therefore should be used carefully.
 
14
A vocabulary is also known called a “schema”, a “data dictionary”, or an“ontology”.
 
15
The Dublin Core Schema is a vocabulary that can be used to describe web resources (video, images, web pages, etc.), as well as physical resources such as books.
 
16
GoodRelations is a vocabulary for product, price, store, and company data that can be embedded into web pages to be automatically processed by intelligent applications.
 
17
The definition of the service modelmodel_SLastFM is not provided in this running example.
 
20
Since clients might require descriptions for all resources to interact with them, not included resources have to provide similar information directly, which can be retrieved at runtime for example via the HTTP OPTIONS method.
 
21
The description of the legal and price modules are not covered in this chapter.
 
22
The operations of an HTTP-based REST API are also referred to with the term HTTP methods.
 
23
See IETF RFC7230 athttp://​tools.​ietf.​org/​html/​rfc7230 et seq. for details
 
24
If another format like JSON or XML is used, a description needs to make the implicit semantics of the data explicit.
 
25
For a detailed description of how to calculate the described metrics see [36].
 
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Stadtmüller S et al (2013) Comparing major web service paradigms. In: Workshop on services and applications over linked APIs and data, vol 1056. CEUR-WS, 2013
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Cardoso J et al (2010) Towards a unified service description language for the internet of services: requirements and first developments. In: IEEE international conference on services computing (SCC), FL, pp 602–609
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Pedrinaci C, Cardoso J, Leidig T (2014) Linked USDL: a vocabulary for web-scale service trading. Lecture notes in computer science, vol 8465. Springer, Berlin, pp 68–82
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Cardoso J, Winkler M, Voigt K (2009) A service description language for the internet of services. In: International symposium on services science (ISSS), Leipzig, 2009
Metadaten
Titel
Service Semantics
verfasst von
Steffen Stadtmüller
Jorge Cardoso
Martin Junghans
Copyright-Jahr
2015
Buch
Fundamentals of Service Systems

Print ISBN: 978-3-319-23194-5

Electronic ISBN: 978-3-319-23195-2

Copyright-Jahr: 2015

DOI
https://doi.org/10.1007/978-3-319-23195-2_5