Web Services

         Web services is nothing but a resource through which you can convert your application into web application, also it helps data transfer between various platforms and applications and the most recommended format of transferring data is XML. XML has been recognized by W3C to be used exclusively for web services, in other words data is carried out in XMLs.

        Web services basically consists of three elements :

1. SOAP

2. WSDL

3. UDDI

SOAP : SOAP is Simple Object Access Protocol, which enables the transfer of data between various platforms and different languages, so this becomes the main part of web services. It uses HTTP protocol for the transfer of data.

SOAP basically consists of 

• Envelope
• Header
• Body
• Fault

Envelope : Envelope is the root element of the SOAP message, it consists soap:xmlns namespace which has default value of : 

---------------------------------------------------------------------------

"http://www.w3.org/2001/12/soap-envelope"

---------------------------------------------------------------------------

Example :
---------------------------------------------------------------------------------------------------------

<?xml version="1.0"?>

<soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

............
Messages that you want to transfer

............
</soap:Envelope>

---------------------------------------------------------------------------------------------------------

If any namespace other than soap:xmlns is used, it will not allow the transfer and generate an error.

SOAP encoding Style attribute : It is the basic encoding style used in the SOAP

soap:encodingStyle="URI".

Header : Header is the first element of Envelope element in the SOAP message. It contains three attributes : 

• mustUnderstand
• actor
• encodingStyle

Body : This contains the actual message that will be transferred.

------------------------------------------------------------------------------------------------------------

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

<soap:Body>
  <m:GetPrice xmlns:m="http://www.w3schools.com/prices">
    <m:Item>Apples</m:Item>
  </m:GetPrice>
</soap:Body>

</soap:Envelope>

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Fault : It is an optional element and it is used to indicate error messages.

WSDL : Web Services Description Language, is other part of web services which is used to locate and describe the application that is converted into web application. It's simply a link that takes you to the application, in other words you convert the data that is inter-operable between different platforms using SOAP and WSDL takes you to that data.

UDDI : Universal Description, Discovery and Intergration, is a kind of directory for storing the information about web services it transfers data via SOAP.

If you want to learn more about Web Services refer : 

http://w3schools.com/webservices/ws_why.asp

Things that you must look while buying an Android

                     Android had and had been a better Operating system for mobiles, but it all depends on the better hardware that you have with you like RAM, Internal Memory etc. There are many good smartphone companies releasing phones, when you are not sure about requirements make sure what you are going to use your smartphone for, if you want to go for social networking, smartphone with less RAM and internal memory would suffice, but you will have to sacrifice the performance, if you aim at performance, graphics and have the desire to explore whole lot of new applications, I would recommend you go for a higher RAM and internal memory. For better performance I would recommend a minimum of 500MB RAM and an internal memory of at least 1 GB.

If you want to go with high price I would recommend : 

Samsung Note II

Samsung Galaxy S III

If you want to go with moderate price, I would recommend:  

HTC Desire V

Samsung Galaxy S Advance

If you want to go with low price I would recommend : 

Sony Xperia Miro

Sony Xperia Neo L