Web Services

Question 1

web services

Answer 1

• implementation of business logic that operates independent of other services
• consumer/provider applications that interact through HTTP protocol
• exchange data using some structured language
  
  • SOAP, XML, JSON, etc.
• programs developed in different languages can interact

Question 2

SOAP

Answer 2

• Messages structured in XML
• Messages sent with POST

Question 3

REST

Answer 3

• Use various HTTP methods
• Support mutiple data formats

Question 4

SOA

Answer 4

• Service-oriented architecture
• Architectural principles where programs consist of
  
  • Small services with well-defined interfaces
  • Services are loosely coupled
• Implemented with web services

Question 5

WSDL

Answer 5

• Web Service Definition Language
• defines the contract for a SOAP service
• implemented with XML

Question 6

WADL

Answer 6

• Web Application Definition Language
• defines the contract of a REST service
• implemented with XML

Question 7

XML

Answer 7

• extensible markup language

Question 8

XSD

Answer 8

• XML schema definition
• Refers to:
  
  1. a schema used by a particular XML document
  2. the language in which said schemas are written
• XSD files have an .xsd ending
• XSD files are also written in XML (using the XSD language)

Question 9

XML namespace

Answer 9

• an approach to preventing name conflicts by differentating between attributes with the same names
• achieved through a prefix
• Example:
  New York
• targetNamespace
  
  • an arbitrary unique identifier for a schema
  • typically the URL of the company
• prefix

Question 10

xmlns

Answer 10

• a pre-defined XML attribute that is used to define a namespace prefix
• Syntax:
  xmlns: pre=”www.website.com”
• where pre is the prefix that will be used throughout the XML file