Networking Reference
In-Depth Information
Fig. 3.3 PEM components
composition of mashups with traditional Web services (based on SOAP, third party
APIs or REST, for instance) and SQL databases. OMA provides the EMML specifi-
cation, the EMML schema, and an open source implementation of reference, which
allows processing EMML scripts. An EMML file is a mashup script written in
Finally, the Web 3.0 Integration Module (WIM) integrates smart objects with
Web 3.0 applications and platforms, so as to promote interactivity and data sharing;
specially allowing the building of physical Web mashups encompassing informa-
tion provided by real world devices and enriched with semantic information. WIM
allows the publication of data provided byWSNs following LinkedOpenData (LOD)
principles [ 15 ]. LOD [ 14 ] is a set of best practices for publishing and connecting
structured data sets on the Web, in order to create a “Web of Data”. Published data
that follow the LOD principles have well-defined structure and semantics, allowing
its processing by computational methods. According to the principles [ 15 ], data pub-
lished in the Web must be in RDF (Resource Description Framework [ 24 ]) format.
RDF is a family of W3C (World Wide Web Consortium) specifications, used as a
general method for conceptual description or data modelling. LOD can help deal-
ing with the growing volume of sensed data, thus contributing to the deployment
of large-scale WSNs. On the other hand, by interconnecting sensor data with other
types of data, such as environmental and sociological data, enhanced information
can be delivered to the end user or application. Some proposals for publishing sensor
data by following the LOD principles can be seen in [ 2 , 14 , 19 , 20 ]. These proposals
do not consider, in general, intrinsic characteristics of WSN such as limited energy,
asynchronous communication and low processing capacity. Thus, the WIM module
of the SmartSensor infrastructure extends and adapts the LOD principles for integra-
tion of sensor data. The five main components of this module are (Fig. 3.4 ): (i) Data
Capture , responsible for receiving data and metadata sent from one or more WSNs;
(ii) Data Transformation , responsible for transforming the sensor data received from
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