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J2EE Interview Questions and Answers
What is Web server ?
Software that provides services to access the Internet, an intranet, or
an extranet. A Web server hosts Web sites, provides support for HTTP and
other protocols, and executes server-side programs (such as CGI scripts
or servlets) that perform certain functions. In the J2EE architecture, a
Web server provides services to a Web container. For example, a Web
container typically relies on a Web server to provide HTTP message
handling. The J2EE architecture assumes that a Web container is hosted
by a Web server from the same vendor, so it does not specify the
contract between these two entities. A Web server can host one or more
Web containers.
What is Web server provider ?
A vendor that supplies a Web server.
What is Web service ?
An application that exists in a distributed environment, such as the
Internet. A Web service accepts a request, performs its function based
on the request, and returns a response. The request and the response can
be part of the same operation, or they can occur separately, in which
case the consumer does not need to wait for a response. Both the request
and the response usually take the form of XML, a portable
data-interchange format, and are delivered over a wire protocol, such as
HTTP.
What is well-formed ?
An XML document that is syntactically correct. It does not have any
angle brackets that are not part of tags, all tags have an ending tag or
are themselves self-ending, and all tags are fully nested. Knowing that
a document is well formed makes it possible to process it. However, a
well-formed document may not be valid. To determine that, you need a
validating parser and a DTD.
What is Xalan ?
An interpreting version of XSLT.
What is XHTML ?
An XML look-alike for HTML defined by one of several XHTML DTDs. To use
XHTML for everything would of course defeat the purpose of XML, because
the idea of XML is to identify information content, and not just to tell
how to display it. You can reference it in a DTD, which allows you to
say, for example, that the text in an element can contain < em > and < b
> tags rather than being limited to plain text.
What is XLink ?
The part of the XLL specification that is concerned with specifying
links between documents.
What is XLL ?
The XML Link Language specification, consisting of XLink and XPointer.
What is XML ?
Extensible Markup Language. A markup language that allows you to define
the tags (markup) needed to identify the content, data, and text in XML
documents. It differs from HTML, the markup language most often used to
present information on the Internet. HTML has fixed tags that deal
mainly with style or presentation. An XML document must undergo a
transformation into a language with style tags under the control of a
style sheet before it can be presented by a browser or other
presentation mechanism. Two types of style sheets used with XML are CSS
and XSL. Typically, XML is transformed into HTML for presentation.
Although tags can be defined as needed in the generation of an XML
document, a document type definition (DTD) can be used to define the
elements allowed in a particular type of document. A document can be
compared by using the rules in the DTD to determine its validity and to
locate particular elements in the document. A Web services application's
J2EE deployment descriptors are expressed in XML with schemas defining
allowed elements. Programs for processing XML documents use SAX or DOM
APIs.
What is XML registry ?
An infrastructure that enables the building, deployment, and discovery
of Web services. It is a neutral third party that facilitates dynamic
and loosely coupled business-to-business (B2B) interactions.
What is XML Schema ?
The W3C specification for defining the structure, content, and semantics
of XML documents.
What is XPath ?
An addressing mechanism for identifying the parts of an XML document.
What is XPointer ?
The part of the XLL specification that is concerned with identifying
sections of documents so that they can be referenced in links or
included in other documents.
What is XSL-FO ?
A subcomponent of XSL used for describing font sizes, page layouts, and
how information flows from one page to another.
What is component (JavaServer Faces technology) ?
A user interface control that outputs data to a client or allows a user
to input data to a JavaServer Faces application.
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