In this paper, Investigating SOAP and XML technologies in web service is studied. The reason for using XML technology to transmit data and also the need for application of existing communicative structure in SOAP technology in web pages with WSDL technology are investigated uniquely. And also the need for searchable address giving for web service which is available in UDDI technology and the advantages of using it are explained for programmers.
The document discusses the Open Grid Services Architecture (OGSA) and related concepts. Some key points:
- OGSA is a service-oriented architecture for grids based on integrating grid and web services concepts.
- The Open Grid Services Infrastructure (OGSI) specification defines interfaces and protocols for services in a grid environment to provide interoperability.
- Core constructs of OGSA include functional blocks, protocols, grid services, APIs, and software development kits.
Web services concepts, protocols and developmentishmecse13
Web services allow applications to communicate over the Internet through open standards and protocols. They are self-contained, modular applications that can be described, published, located, and invoked over a network, typically the Internet. Key technologies that enable web services include XML, SOAP, WSDL, and UDDI. SOAP is a messaging protocol that allows communication between applications over HTTP. WSDL describes how to access web services and what operations they perform. UDDI provides a registry for businesses to publish and discover web services.
This document discusses various XML applications and technologies. It describes 13 different XML technologies including Wireless Markup Language (WML), XML News, Channel Definition Format (CDF), Open Software Distribution (OSD), Open Financial Exchange (OFX), RDF/XML, Mathematical Markup Language (MathML), Platform for Privacy Preferences Project (P3P), Human Resource Management Markup Language (HRMML), Voice Extensible Markup Language (VXML), Vector Markup Language (VML), Scalable Vector Graphics (SVG), and Synchronized Multimedia Integration Language (SMIL). Each technology is briefly described and its advantages are listed.
The document discusses XML schemas and their use in describing messages exchanged by web services. It provides an overview of XML schema components like elements, data types, and attributes. It also discusses how schemas are used to define the structure and rules for XML documents. The document then gives examples of managing WSDL and XML schema documents in a global cache, which improves performance for services that validate messages against cached schemas.
Performance of Web Services on Smart Phone PlatformsIOSR Journals
This document discusses and compares the performance of Web Services on smart phone platforms using SOAP and REST. It begins with an introduction to Web Services and the problems with using SOAP on mobile devices due to its limitations in processing power, bandwidth usage, and flexibility. It then proposes using RESTful Web Services as an alternative as they avoid XML parsing and are based on the lightweight HTTP protocol. The document analyzes the performance of SOAP versus REST Web Services on a mobile device to determine which is more efficient for smart phones.
The document discusses XML schemas and how they are used in web services. Some key points:
1. XML schemas formally describe the structure and content of XML documents, defining elements, attributes, data types, and relationships between elements.
2. Schemas are used to validate XML documents and ensure they conform to the defined structure.
3. The document discusses how BT uses XML schemas to describe messages exchanged between web services and the importance of consistent implementation to allow for interoperability.
4. It also mentions best practices like using test cases and focusing on description to communicate how aspects of schemas can be relied upon.
This document provides an overview of Service Oriented Architecture (SOA) and its enabling technologies. It discusses key SOA principles like loose coupling, standardized service contracts, and service reusability. The document also covers major SOA objectives, benefits, architecture layers, and the differences between SOA and web services. Web services are described as a standardized way for applications to communicate over the web using XML, SOAP, WSDL and other standards. The document contrasts SOA with public-subscribe and pull-based vs push-based messaging architectures.
Microsoft .NET is a software framework that allows for the creation of web services and applications across different operating systems and devices. It consists of tools and libraries for building web services using XML and SOAP, as well as components, servers, and clients that can access and deliver these services. At the core of .NET is the Common Language Runtime, which provides memory management, security, and execution for any code built on the .NET framework.
The document discusses the Open Grid Services Architecture (OGSA) and related concepts. Some key points:
- OGSA is a service-oriented architecture for grids based on integrating grid and web services concepts.
- The Open Grid Services Infrastructure (OGSI) specification defines interfaces and protocols for services in a grid environment to provide interoperability.
- Core constructs of OGSA include functional blocks, protocols, grid services, APIs, and software development kits.
Web services concepts, protocols and developmentishmecse13
Web services allow applications to communicate over the Internet through open standards and protocols. They are self-contained, modular applications that can be described, published, located, and invoked over a network, typically the Internet. Key technologies that enable web services include XML, SOAP, WSDL, and UDDI. SOAP is a messaging protocol that allows communication between applications over HTTP. WSDL describes how to access web services and what operations they perform. UDDI provides a registry for businesses to publish and discover web services.
This document discusses various XML applications and technologies. It describes 13 different XML technologies including Wireless Markup Language (WML), XML News, Channel Definition Format (CDF), Open Software Distribution (OSD), Open Financial Exchange (OFX), RDF/XML, Mathematical Markup Language (MathML), Platform for Privacy Preferences Project (P3P), Human Resource Management Markup Language (HRMML), Voice Extensible Markup Language (VXML), Vector Markup Language (VML), Scalable Vector Graphics (SVG), and Synchronized Multimedia Integration Language (SMIL). Each technology is briefly described and its advantages are listed.
The document discusses XML schemas and their use in describing messages exchanged by web services. It provides an overview of XML schema components like elements, data types, and attributes. It also discusses how schemas are used to define the structure and rules for XML documents. The document then gives examples of managing WSDL and XML schema documents in a global cache, which improves performance for services that validate messages against cached schemas.
Performance of Web Services on Smart Phone PlatformsIOSR Journals
This document discusses and compares the performance of Web Services on smart phone platforms using SOAP and REST. It begins with an introduction to Web Services and the problems with using SOAP on mobile devices due to its limitations in processing power, bandwidth usage, and flexibility. It then proposes using RESTful Web Services as an alternative as they avoid XML parsing and are based on the lightweight HTTP protocol. The document analyzes the performance of SOAP versus REST Web Services on a mobile device to determine which is more efficient for smart phones.
The document discusses XML schemas and how they are used in web services. Some key points:
1. XML schemas formally describe the structure and content of XML documents, defining elements, attributes, data types, and relationships between elements.
2. Schemas are used to validate XML documents and ensure they conform to the defined structure.
3. The document discusses how BT uses XML schemas to describe messages exchanged between web services and the importance of consistent implementation to allow for interoperability.
4. It also mentions best practices like using test cases and focusing on description to communicate how aspects of schemas can be relied upon.
This document provides an overview of Service Oriented Architecture (SOA) and its enabling technologies. It discusses key SOA principles like loose coupling, standardized service contracts, and service reusability. The document also covers major SOA objectives, benefits, architecture layers, and the differences between SOA and web services. Web services are described as a standardized way for applications to communicate over the web using XML, SOAP, WSDL and other standards. The document contrasts SOA with public-subscribe and pull-based vs push-based messaging architectures.
Microsoft .NET is a software framework that allows for the creation of web services and applications across different operating systems and devices. It consists of tools and libraries for building web services using XML and SOAP, as well as components, servers, and clients that can access and deliver these services. At the core of .NET is the Common Language Runtime, which provides memory management, security, and execution for any code built on the .NET framework.
.NET incorporates a software platform for building the .NET experiences, which means servers running databases, Web servers, and other systems. This isn't that different from the way we run our enterprises today; the differences are in the capabilities of these products. Today we have messaging systems like Exchange and databases like SQL Server, and these will be fundamental components of .NET. But products like BizTalk Server for orchestrating information through the enterprise, Application Center for managing these servers running .NET, and Mobile Information Server for providing the services for the mobile users, also will be part of .NET.
The .NET product will include a programming model with tools. This will allow developers to create the Web services that .NET is based on. The model is the .NET Framework, which will be described later on in this document.
The final component of .NET is the end result of the programming model, tools, and platform. Web services provide the services and information users will require of Phase 3 of the Internet. Because these Web services are programmable, they allow a user to use any device to access this information and to share this information with other sites and services.
Here are some sample web services projects to try:
- Currency conversion service: Converts between currencies using live exchange rates
- Weather service: Gets current weather conditions for a city by calling a public API
- Book search service: Searches book titles and descriptions from a database
- Calculator service: Provides basic math operations like add, subtract, multiply, divide
- Address validation service: Validates and standardizes address fields for a location
- Image processing service: Resizes, crops or applies filters to images uploaded to a server
These cover common domains like finance, data, calculation etc. and demonstrate basic CRUD operations, external API calls, file uploads etc. Good for learning core web service concepts.
This document summarizes the anatomy of a web service. It discusses that web services allow applications and devices to communicate independently of platform or language. It describes the key components of web services - SOAP messages for communication, WSDL files that describe the service, and UDDI for finding services. The document provides details on how web services work using SOAP and WSDL. It explains that web services address limitations of prior technologies like EDI and CORBA by being more open, standardized, and compatible.
A web service is defined as a software system designed to support interoperable machine-to-machine interaction over a network. Put in another way, Web services provide a framework for system integration, independent of programming language and operating system. Web services are widely deployed in current distributed systems and have become the technology of choice. The suitability of Web services for integrating heterogeneous systems is largely facilitated through its extensive use of the Extensible Markup Language (XML). Thus, the security of a Web services based system depends not only on the security of the services themselves, but also on the confidentiality and integrity of the XML based SOAP messages used for communication. Recently, Web services have generated great interests in both vendors and researchers. A web service, based on existing Internet protocols and open standards, and provides a flexible solution to the problem of application integration. This paper provides an overview of the web services, web service security and the various algorithms used for encryption of the SOAP messages.
The document provides an overview of web services and their components. It discusses Service Oriented Architecture (SOA) and how web services implement SOA. The key components of web services identified are XML-RPC, SOAP, WSDL, and UDDI. SOAP is an XML-based protocol for exchanging messages between computers. WSDL provides a standard way to describe web services. UDDI allows services to be published and discovered.
Web services allow programs developed in different languages to communicate over a network by exchanging XML messages. A web service is a software module that uses HTTP and XML to provide a standardized interface. Key components of web services include SOAP for messaging, WSDL for describing available services, and UDDI for discovering services. A client can search UDDI to find a WSDL file describing a web service and then use SOAP calls defined in WSDL to invoke the service functionality over the network.
Service Oriented Architecture Updated Luqmanguesteb791b
This document provides an overview of service oriented architecture (SOA) and web services. It defines SOA as an architectural style that promotes loose coupling between components. The key benefits of SOA include flexibility, reusability, and the ability to integrate systems. Web services are described as a standard way to implement SOA using XML, SOAP, WSDL and UDDI. The roles of a service, consumer and provider in SOA are also outlined.
This document provides an overview of Java web services. It discusses the key concepts of web services architecture including WSDL, SOAP, and UDDI. WSDL is an XML format for describing web services, SOAP is a messaging protocol for making procedure calls over a network, and UDDI is a registry for web services. The document also provides details on how these technologies interact and the role they play in web services.
A Study Of Web Services And Its ImplicationsTony Lisko
This document presents a study comparing Web Services using SOAP and REST frameworks. It discusses that SOAP uses XML messaging over HTTP and defines standards for operations, while REST uses HTTP methods to manipulate resources and has a stateless architecture. The document provides details on SOAP and REST architectures and implementations, and concludes that while SOAP is widely used in enterprise applications, REST has advantages for performance and is growing in popularity for public applications due to its simplicity.
The document discusses key concepts related to web services including XML, WSDL, SOAP, and UDDI. It provides details on each component and how they work together to enable integration and communication between systems. Examples are given around publishing a company's inventory availability as a web service and how different vendor applications can interact using web services despite being on different platforms.
This document describes a final year project to develop an SQL converter tool. The tool will convert SQL database files to XML and JSON file formats. The objectives are to identify suitable semi-structured data formats for converted structured SQL data and develop a tool that allows users to upload SQL files, select an output format, and download the converted XML or JSON files. The project uses Java and follows an iterative development methodology. The prototype developed allows users to perform basic SQL to XML/JSON conversions through a web interface.
1. The document discusses common standards and cloud platforms used in cloud computing. It covers standards for common goals like portability and migration, as well as standards for application developers, data formats, messaging, and security.
2. Major cloud platforms discussed include Amazon Web Services, Google AppEngine, and Microsoft Azure. It also outlines common standards organizations like the Open Cloud Consortium and Distributed Management Task Force.
3. The document provides details on specific standards like XML, JSON, LAMP, LAPP, SMTP, and security standards like ISO and HIPAA.
The document discusses web services and how they allow different software applications to communicate and share resources despite running on different platforms or using different programming languages. Web services use open standards like XML, SOAP and HTTP to define interfaces and transmit data between applications in a self-contained, platform-independent way. They enable reuse of application components and integration of existing software.
Web services use SOAP and XML messaging instead of traditional HTTP. They are not tied to any specific protocol. WSDL defines the methods and messages for a web service. UDDI provides a registry for discovering web services. At its core, .NET uses XML and open standards like SOAP, WSDL, and UDDI to enable interoperable web services and components across platforms and languages.
Web services allow applications to share data and capabilities across various operating systems, platforms, and devices using standard web technologies like HTTP, XML, and SOAP. A web service is a programmable application accessible via standard web protocols that is self-contained, self-describing, and loosely coupled. The web services architecture includes communication channels, XML for data representation and exchange, WSDL for describing services, and UDDI for service discovery. Web services offer advantages like platform independence, use of open standards, and easy incorporation into existing XML messaging solutions.
This document discusses the SOAP toolkit for Visual Studio 6.0, which provides tools for building and consuming web services. It introduces key concepts like XML, SOAP, and SDL. The toolkit contains components like a remote object proxy engine and SDL parser to make it easy to expose existing COM objects as web services and consume services without dealing directly with XML or network protocols. Sample applications are demonstrated to show how existing code can integrate with web services using the toolkit.
This application having database which is a repository of an organization’s electronically stored data. The databases are designed to facilitate analysis.
The classic Functionality of this Application focuses on data storage. However, the means to retrieve and analyze data, to extract, transform and load data, and to manage the data dictionary. To facilitate easy maintenance of records of various Recruiters (Companies), job and job seekers.
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
.NET incorporates a software platform for building the .NET experiences, which means servers running databases, Web servers, and other systems. This isn't that different from the way we run our enterprises today; the differences are in the capabilities of these products. Today we have messaging systems like Exchange and databases like SQL Server, and these will be fundamental components of .NET. But products like BizTalk Server for orchestrating information through the enterprise, Application Center for managing these servers running .NET, and Mobile Information Server for providing the services for the mobile users, also will be part of .NET.
The .NET product will include a programming model with tools. This will allow developers to create the Web services that .NET is based on. The model is the .NET Framework, which will be described later on in this document.
The final component of .NET is the end result of the programming model, tools, and platform. Web services provide the services and information users will require of Phase 3 of the Internet. Because these Web services are programmable, they allow a user to use any device to access this information and to share this information with other sites and services.
Here are some sample web services projects to try:
- Currency conversion service: Converts between currencies using live exchange rates
- Weather service: Gets current weather conditions for a city by calling a public API
- Book search service: Searches book titles and descriptions from a database
- Calculator service: Provides basic math operations like add, subtract, multiply, divide
- Address validation service: Validates and standardizes address fields for a location
- Image processing service: Resizes, crops or applies filters to images uploaded to a server
These cover common domains like finance, data, calculation etc. and demonstrate basic CRUD operations, external API calls, file uploads etc. Good for learning core web service concepts.
This document summarizes the anatomy of a web service. It discusses that web services allow applications and devices to communicate independently of platform or language. It describes the key components of web services - SOAP messages for communication, WSDL files that describe the service, and UDDI for finding services. The document provides details on how web services work using SOAP and WSDL. It explains that web services address limitations of prior technologies like EDI and CORBA by being more open, standardized, and compatible.
A web service is defined as a software system designed to support interoperable machine-to-machine interaction over a network. Put in another way, Web services provide a framework for system integration, independent of programming language and operating system. Web services are widely deployed in current distributed systems and have become the technology of choice. The suitability of Web services for integrating heterogeneous systems is largely facilitated through its extensive use of the Extensible Markup Language (XML). Thus, the security of a Web services based system depends not only on the security of the services themselves, but also on the confidentiality and integrity of the XML based SOAP messages used for communication. Recently, Web services have generated great interests in both vendors and researchers. A web service, based on existing Internet protocols and open standards, and provides a flexible solution to the problem of application integration. This paper provides an overview of the web services, web service security and the various algorithms used for encryption of the SOAP messages.
The document provides an overview of web services and their components. It discusses Service Oriented Architecture (SOA) and how web services implement SOA. The key components of web services identified are XML-RPC, SOAP, WSDL, and UDDI. SOAP is an XML-based protocol for exchanging messages between computers. WSDL provides a standard way to describe web services. UDDI allows services to be published and discovered.
Web services allow programs developed in different languages to communicate over a network by exchanging XML messages. A web service is a software module that uses HTTP and XML to provide a standardized interface. Key components of web services include SOAP for messaging, WSDL for describing available services, and UDDI for discovering services. A client can search UDDI to find a WSDL file describing a web service and then use SOAP calls defined in WSDL to invoke the service functionality over the network.
Service Oriented Architecture Updated Luqmanguesteb791b
This document provides an overview of service oriented architecture (SOA) and web services. It defines SOA as an architectural style that promotes loose coupling between components. The key benefits of SOA include flexibility, reusability, and the ability to integrate systems. Web services are described as a standard way to implement SOA using XML, SOAP, WSDL and UDDI. The roles of a service, consumer and provider in SOA are also outlined.
This document provides an overview of Java web services. It discusses the key concepts of web services architecture including WSDL, SOAP, and UDDI. WSDL is an XML format for describing web services, SOAP is a messaging protocol for making procedure calls over a network, and UDDI is a registry for web services. The document also provides details on how these technologies interact and the role they play in web services.
A Study Of Web Services And Its ImplicationsTony Lisko
This document presents a study comparing Web Services using SOAP and REST frameworks. It discusses that SOAP uses XML messaging over HTTP and defines standards for operations, while REST uses HTTP methods to manipulate resources and has a stateless architecture. The document provides details on SOAP and REST architectures and implementations, and concludes that while SOAP is widely used in enterprise applications, REST has advantages for performance and is growing in popularity for public applications due to its simplicity.
The document discusses key concepts related to web services including XML, WSDL, SOAP, and UDDI. It provides details on each component and how they work together to enable integration and communication between systems. Examples are given around publishing a company's inventory availability as a web service and how different vendor applications can interact using web services despite being on different platforms.
This document describes a final year project to develop an SQL converter tool. The tool will convert SQL database files to XML and JSON file formats. The objectives are to identify suitable semi-structured data formats for converted structured SQL data and develop a tool that allows users to upload SQL files, select an output format, and download the converted XML or JSON files. The project uses Java and follows an iterative development methodology. The prototype developed allows users to perform basic SQL to XML/JSON conversions through a web interface.
1. The document discusses common standards and cloud platforms used in cloud computing. It covers standards for common goals like portability and migration, as well as standards for application developers, data formats, messaging, and security.
2. Major cloud platforms discussed include Amazon Web Services, Google AppEngine, and Microsoft Azure. It also outlines common standards organizations like the Open Cloud Consortium and Distributed Management Task Force.
3. The document provides details on specific standards like XML, JSON, LAMP, LAPP, SMTP, and security standards like ISO and HIPAA.
The document discusses web services and how they allow different software applications to communicate and share resources despite running on different platforms or using different programming languages. Web services use open standards like XML, SOAP and HTTP to define interfaces and transmit data between applications in a self-contained, platform-independent way. They enable reuse of application components and integration of existing software.
Web services use SOAP and XML messaging instead of traditional HTTP. They are not tied to any specific protocol. WSDL defines the methods and messages for a web service. UDDI provides a registry for discovering web services. At its core, .NET uses XML and open standards like SOAP, WSDL, and UDDI to enable interoperable web services and components across platforms and languages.
Web services allow applications to share data and capabilities across various operating systems, platforms, and devices using standard web technologies like HTTP, XML, and SOAP. A web service is a programmable application accessible via standard web protocols that is self-contained, self-describing, and loosely coupled. The web services architecture includes communication channels, XML for data representation and exchange, WSDL for describing services, and UDDI for service discovery. Web services offer advantages like platform independence, use of open standards, and easy incorporation into existing XML messaging solutions.
This document discusses the SOAP toolkit for Visual Studio 6.0, which provides tools for building and consuming web services. It introduces key concepts like XML, SOAP, and SDL. The toolkit contains components like a remote object proxy engine and SDL parser to make it easy to expose existing COM objects as web services and consume services without dealing directly with XML or network protocols. Sample applications are demonstrated to show how existing code can integrate with web services using the toolkit.
This application having database which is a repository of an organization’s electronically stored data. The databases are designed to facilitate analysis.
The classic Functionality of this Application focuses on data storage. However, the means to retrieve and analyze data, to extract, transform and load data, and to manage the data dictionary. To facilitate easy maintenance of records of various Recruiters (Companies), job and job seekers.
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
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Investigating Soap and Xml Technologies in Web Service
1. International Journal on Soft Computing (IJSC) Vol.3, No.4, November 2012
DOI: 10.5121/ijsc.2012.3402 15
INVESTIGATING SOAP AND XML TECHNOLOGIES
IN WEB SERVICE
Mehdi Zekriyapanah Gashti
Department of Computer Engineering
Payame Noor University
I.R of IRAN
Zekriya@pnu.ac.ir
ABSTRACT
In this paper, Investigating SOAP and XML technologies in web service is studied. The reason for using
XML technology to transmit data and also the need for application of existing communicative structure in
SOAP technology in web pages with WSDL technology are investigated uniquely. And also the need for
searchable address giving for web service which is available in UDDI technology and the advantages of
using it are explained for programmers.
KEYWORDS
XML, SOAP, WSDL, UDDI, OOP, Reliability
1. INTRODUCTION
People who are familiar with IT have heard the name web server for sure. For example, over 66%
of people who have participated in the poll conducted by InfoWorld journal believed that the next
commercial models of internet are web services. Besides, Gartner group has predicted that web
services increase efficiency of IT projects to 30%. But, what is a web service and how it will
change the form of business in internet?
In order to simplify commercial processing, non-concentrated programs (enterprises) shall
connect to each other and use common data of each other. Before, this was done by invention of
private standards and format of data in the special form required by each program. But the web
world and XML increased free technology to transmit data and the information between systems.
Web services are the software using XML to transmit data between other software via prevalent
internet protocols. In a simple way, a web service does some actions by web and the functions or
subroutines send the results to other programs. This means that the program that is launched in a
computer sends data to other computer and asks for respond. The program in second computer
does the requested actions and returns results based on internet structures for the first program
[1,2].
2. WEB SERVICES
Web services can use numerous protocols in internet. However they use HTTP, which is the most
important one, the most. Web services can do anything. For example, in a program, they can take
the last news titles from web service of Associated Press or for instance, a financial program can
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take the last news and stock data via a web service. What a web service does can be as simple as
multiplying two figures or as complicated as performing all subscription affairs of a company.
Web service has properties making it different from other technologies and computer models.
Paul Flessner, vice-president of Microsoft has mentioned several characteristics for a web service
in dot NET Enterprise Server. First is that web services are programmable. A web service keeps
secret what it does. When a program gave data to it, web service would process it and would
return that data for the main program as respond. Second, web services are made base on XML
and the XMLs based on SOAP or Simple Object Access Protocol are technologies provide web
services with the possibility to connect to other programs even if those programs are written in
different languages and are launched in different computers [3].
Also, web services are self-describing. It means that they explain what they do and their usage
method. These explanations are generally Web Services Description Language (WSDL). WSDL
is a standard based on XML. Besides, web services are detectable. It means that program writer
can search for desired web service in directories such as Universal Description, Discovery and
Integration (UDDI). UDDI is another standard for web service.
3. WEB SERVICE TECHNOLOGIES
As it was explained before, one of the reasons for separating web service from other existing
technologies is use of XML and some other technical standards such as SOAP, WSDL and
UDDI. These technologies provide the filed for connection between programs in a way
independent from program writing language, operating system and hardware. SOAP creates a
communicative mechanism between software and web service. WSDL is a unique method for
describing web service and UDDI makes a searchable directory for web service. When they get
together in a place, these technologies provide program writer with the possibility to prepare the
programs as service and launch them on internet [3].
3.1. XML
Extensible Markup Language (XML) is a technology vastly supported. This technology is open
and it means that it doesn’t belong to a special company. First time in WWW consortium or W3C
in 1996, it was created for simplifying data transmission. By expansion of using web in 90s, little
by little the limitations f HTML revealed. Weakness of HTML in extensibility (ability to add and
subtract properties) and its weakness in describing data keeping inside it disappointed the
program writers. Also, vagueness of its definitions stopped it from development. In respond to
these problems, W3C added a series of facilities on it along developing HTML that provided the
possibility to change structure of texts in HTML. This is called Cascade Style Sheet (CSS). This
development was just a temporary solution. A standard, extensible method with strong structure
should have been created. As a result, W3C made XML. XML has power and extensibility of
Standard Generalized Markup Language (SGML) and the simplicity that web requires [4].
Independence of data or separation of content from appearance is assumed as a characteristic for
XML. XML texts just describe a data and the program familiar to XML can make any change to
the data inside XML file regardless of language and operating system. XML texts are consistent
of data without a special form, thus the program that is going to use them should know how to
display them. Therefore, display form of a XML file can be different in a PC, PDA and Cell
Phone.
When a program confronts a XML text, it will ensure that it contains its subjective data. This
assurance is gained by programs such as XML Parser. The analyzers investigate the orders of
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XML text. Also, they help program to interpret XML texts. Each XML text can voluntarily refer
to another text containing structure of the main XML file. The second XML text is called
Document Type Definition (DTD).
When XML file refers to DTD, the analyzer program investigates the main file with DTD to find
out whether it is formed by the same structure described in DTD or not. If a XML analyzer can
correctly process a text, the XML text is also formatted appropriately. When most software
increases their web facilities, it seems that XML will be chosen as a global technology to transmit
data between programs. All programs using XML will be able understand the XML of each other.
This high level of adjustment between programs makes XML to be an appropriate technology for
web services, because without the need for the same operating system and hardware, data can be
transmitted [5].
3.2. SOAP
Simple Object Access Protocol (SOAP) is one of the most prevalent standards used in web
services. According to evident, first time it was made by Developer Mentor, User Land Company
and Microsoft in 1998 and its first version was presented in 1999. The version 1.2 is indicative of
hard work and high eagerness of IT to use SOAP and web service.
The main objective of SOAP is to create a method to send data between systems distributed on
net. When a program starts to communicate with web service, SOAP messages are used for
connection and data transmission between them. SOAP message is sent to web service and a
function or subroutine in launches it. This means that this message has requested web service to
do something. Web service uses SOAP message to start its operation. At the end, sends the results
for the main program with a SOAP message [6].
SOAP protocol as a XML-based protocol is composed of a series of XML schemas. These
schemas specify the shape of XML messages which are transmitted on the net, like as the data
and information that facilitate text’s interpretation for the third party. In fact, SOAP is designed
for transmission of data on internet via HTTP protocol; however it can also be used in other
models such as LAN. When web services use HTTP, they can easily pass through Firewall.
A message is consistent of three important parts: Envelope, Header and Body. Envelope is used
for wrapping the message. This part describes the content of message and specifies its receiver.
The next part of SOAP messages is its Header, which is an optional part and explains issues such
as security and routing. Body is a part of SOAP message in which subjective data are placed.
Data is based on XML and they follow a specific model that explains schemas. These schemas
help the receiver to correctly interpret the text. SOAP messages are taken by SOAP servers and
they are interpreted so that as a result of that web servers become active and so their function
[7,8].
In order not to use web services in SOAP, a large number of protocols shall be used. For example,
XML-RPC is an old technology which was providing the same facility. Anyway, most of great
software producers prefer SOAP than other technologies. There are a lot of reasons for choosing
SOAP that most of them are about its protocol which is beyond this text. Three major priority of
SOAP compared to other technologies are included of extensibility, simplicity and internal
functionality.
SOAP messages are normally do not have many codes and for sending and receiving them there
is no need for complicated software. SOAP provides the program writer for this possibility to
change it according to its need. At the end, because SOAP uses XML can transmit data by HTTP
regardless of the program writing language, operating system and hardware [9,10].
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A web service in a simple meaning is a kind of component under web. This component provides
the applications using it with the possibility to be able to use methods of this web service. It’s
better to explain web service with an example. Assume that you want to have the climate situation
in your web application, in order to implement it you have two choices:
I. You can gather the climate situation from different sites yourself and use
them in your web application.
II. You can use a web service which provides the climate of different
geographic regions.
In fact, this web service is not working itself, but it has functions that are called by different web
applications that for instance here the web service returns the climate situation. However web
services have more efficient and important usages too, such as working with databases … that
here an example was provided for clarifying the issue.
4. CONCLUSIONS
Not the need for repeated coding. Maybe many individuals who have worked with Object
Oriented programming (OOP) say that this is also possible by class training. Yes, it is possible,
but:
I. In program writing at class you have to add your class in each project, but
in web service you just need to use methods.
II. In working with classes, you may work in different applications with
different classes. It means that each time your work is different and this
reduces eligibility and makes extensibility difficult. However, in using
web service each time you work with a special web service and you work
base on those specific web service methods no matter where and in which
application you are.
III. When you work with service, there is a series of standards for usage that
all applications shall follow and this increases reusability.
Therefore, simply one can conclude that using the mentioned techniques in this paper would lead
to increase in efficiency.
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