Optimized XML-based Web service generation for service communication in restricted embedded environments

Abstract

Embedded network programming remains a highly complex task for developers since unique characteristics of such networks have to be faced: one of them is the communication between a diversity of resource constraint nodes. Another one is the infrastructure dynamics. The widely-used standardized Web service technologies would perfectly meet such unique characteristics and ease the development of applications. Such technologies that enable, e.g., requesting or subscribing service data, however, process usually plain XML documents which are not suitable for small embedded devices with very limited resources. This is due to XML's verbosity, its bandwidth usage, and its associated processing overhead. The paper addresses these issues and describes an innovative and optimized source code generation technique by means of W3C's Efficient XML Interchange (EXI) format for developing XML-based Web services for the embedded domain. This offers developers a seamless use of the wide-spread service protocols in the embedded domain as well. Evaluation results based on the dataset from the ISO/IEC standardization of the vehicle to grid communication interface (V2G CI) prove the applicability of the generated XMLbased Web services of restricted devices in terms of message size, performance, and code footprint.

Microcontrollers as components of service oriented architectures

“…For instance [12] reports sizes of 40 up to 70 kBytes for EXI based web services, while for gSOAP [7] based web services [12] reports sizes of 300 kBytes. Obviously these sizes cannot be written in very limited resource devices such is 8051 microcontroller [22] with only 12 kBytes of flash program memory.…”

“…More recent and interesting works are presented by Käbisch et al in [10], [11] and [12]. These papers are of particular interest since they employ microcontrollersalthough more powerful than we do.…”

“…These papers are of particular interest since they employ microcontrollersalthough more powerful than we do. While in [10] is presented the work in general, showing Web Service code generation and communication based on the EXI (Efficient XML Interchange) [13] format, [11] and [12] show further improvements. According to [10] the automated workflow of Web Service generator for microcontrollers is mainly divided into two phases.…”

Investigating Soap and Xml Technologies in Web Service

“…As a result, W3C made XML. XML has power and extensibility of Standard Generalized Markup Language (SGML) and the simplicity that web requires [4].…”

SecFHIR: A Security Specification Model for Fast Healthcare Interoperability Resources

“…a) XML Parser: To properly validate and utilize the FHIR resource, it must be first parsed and decomposed into its basic elements. In fact, the DOM parser utility [19,20] is utilized by the Security Specification Engine to produce a DOM tree that represents the raw contents for both the schema and resource. Here, the parser first verifies that the resource has valid syntax corresponding to the provided schema, and then builds the parse tree.…”