Term
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Definition
| At a minimum, a Web service is any piece of software that makes itself available over the internet and uses a standardized XML messaging systems. |
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Term
Why are web services needed?
(Hint: 4) |
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Definition
- Provides interoperability between platforms.
- Promotes code resusability.
- Allows for distributed business applications.
- Can be “firewall friendly” when using HTTP. |
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Term
What are the types of Web Services?
(Hint: 2) |
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Definition
- SOAP (Simple Object Access Protocol): a description of an xml messaging protocol.
- REST (Representational State Transfer): a description of an architecture for distributed hypermedia systems. |
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Term
What are the differences between SOAP and REST?
(Hint: 7)
(cntrt, scrty, msgg, trns, tls, bndwth, tmsg) |
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Definition
SOAP - REST
WSDL Contract - No Contract
WS-Security plus SSL for HTTP - SSL for HTTP
WS-Reliable messaging - No reliable messaging
WS-Transaction (atomic) - No transaction
Tools required to implement WS - No tools required
Greater info bandwidth - Lower info bandwidth
SOAP message in TM* - Raw XML/JSON in TM*
*Transport message |
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Term
In what situations would you propose using SOAP or REST? |
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Definition
- SOAP: for any situations requiring xml message encryption, reliable messaging, or atomic transactions.
- REST: whenever you need simple data manipulation of a resource such as that provided by the HTTP verbs GET, PUT, POST, and DELETE. |
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Term
What is the ultimate goal of using web services? |
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Definition
| To achieve a SOA within the organization. |
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Term
What are the two approaches to create a SOAP based web service? |
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Definition
- Top-Down or Contract First: from WSDL, one generates java classes.
- Bottom-Up or Contract Last: from java classes one generates a WSDL.
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Term
What is the web service protocol stack? |
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Definition
Is an evolving set of protocols used to define, discover, and implement Web services. The core protocol stack consists of four layers: Service Transport, XML Messaging, Service Descriptor, & Service Discovery. |
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Term
Is SOAP stateful or stateless protocol? |
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Definition
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Term
What is an XML schema, how does it differ from a DTD? |
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Definition
- XML schema defines which elements and attributes are used in the markup language, how they are ordered and nested, and what their data types are. It also provides simple primitives as well as facilities for more complex types
- DTD fails to address data typing and has a weak typing system. It also doesn't offer some simple data types (int, flt, dble, bool, enum). |
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Term
What is the difference between complex types and simple types in XML schemas? |
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Definition
- Complex types describe how elements are organized and nested.
- Simple types are the primitive data types contained by elements and attributes. |
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Term
What is an XML namespace? |
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Definition
| It provides a qualified name for an XML element or attribute, the same way that a Java package provides a qualified name for a Java class. |
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Term
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Definition
| A distributed object protocol whose primary use is for Application to Application communication. |
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Term
Explain the basic structure of SOAP. |
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Definition
| A SOAP message is a kind of XML document; which has it's own schema, namespace, and processing rules. It consists of the envelope element, header element, & body element. |
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Term
What are the different SOAP messaging modes?
(Hint: 4) |
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Definition
| RPC/Literal, Document/Literal, RPC/Encoded, Document/Encoded. |
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Term
What is Document/Literal mode? |
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Definition
| A messaging mode where a SOAP body element contains an XML document fragment, which contains a application that belongs to an XML schema and namespace. |
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Term
What is RPC/Literal mode? |
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Definition
A messaging mode that enables SOAP messages to model procedure or method calls with parameters and return values. |
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Term
What are the different Messaging Exchange Patterns in WS?
(Hint: 2) |
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Definition
| One-Way and Request/Response. |
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Term
SOAP messages are delivered using which protocol? |
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Definition
| HTTP, though it is possible to use other protocols. Details of non-HTTP bindings are not specified by SOAP and are not supported by the Web Services Basic Profile. |
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Term
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Definition
| A XML markup language used to describe a WS. It specifies the message format, internet protocol, and address for a client to communicate with the WS. |
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Term
Can you explain the basic structure of WSDL? |
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Definition
| A WSDL document is an XML document that adheres to the WSDL XML schema. It must contain the seven important elements nested in the definition/root element. |
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Term
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Definition
A specification for creating a registry service that catalogs organizations (corporations) and their Web Services.
(Universal Description, Discovery, and Integration) |
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Term
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Definition
An API for manipulating the structure of a SOAP message. SAAJ is an API you can use to create, read, or modify SOAP messages using Java.
(SOAP with Attachments API for JAVA) |
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Term
Which API is used to implement web services?
(Hint: 3) |
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Definition
- Java API fro XML Web Services (JAX-WS)
- Java API for XML-Based RPC (JAX-RPC)
- Java API for XML Restful Services (JAX-RS) |
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Term
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Definition
| Provides a convenient way to bind an XML schema to a representation in Java code. |
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Term
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Definition
| Essentially is a Java RPC over SOAP. It is designed as an API for Web Services, so that J2EE applications can operate with non-Java applications. |
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Term
What are the various ways of accessing/calling a web service?
(Hint: 2) |
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Definition
- Asynchronous Call: a application can make a call to the Web Service and then continue to do whatever it wants to do. When the service is ready it will notify the application.
- Synchronous Call: the application has to wait until it has completed. |
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Term
| What seven elements are needed in a WSDL? What do they do? |
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Definition
- Definition: DTD.
- Type: defines input and output datatype.
- Import: states which is input & output param.
- Port-Type: name of class.
- Operations: name of the method(s).
- Binding: transport protocol (HTTP).
- Service: location of service. |
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Term
What messaging modes does Web Services permit?
(Hint: 2) |
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Definition
| RPC/Literal or Document/Literal. |
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Term
| What are the four layers of the Web Service Core protocol stack? |
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Definition
Service Transport, XML Messaging, Service Descriptor, Service Discovery. |
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Term
| What is the difference between Document and RPC? |
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Definition
RPC: adheres to SOAP standard, tightly coupled,primitive datatypes.
Document: no restrictions, loosely coupled, marshall/unmarshall datatypes. |
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