Xml - Interview Questions and Answers for 'American express' | Search Interview Question

Xml - Interview Questions and Answers for 'American express' - 7 question(s) found - Order By Newest

Q1. Difference between SAX and DOM Parser ?

Ans. A DOM (Document Object Model) parser creates a tree structure in memory from an input document whereas A SAX (Simple API for XML) parser does not create any internal structure.

A SAX parser serves the client application always only with pieces of the document at any given time whereas A DOM parser always serves the client application with the entire document no matter how much is actually needed by the client.

A SAX parser, however, is much more space efficient in case of a big input document whereas DOM parser is rich in functionality.

Use a DOM Parser if you need to refer to different document areas before giving back the information. Use SAX is you just need unrelated nuclear information from different areas.

Xerces, Crimson are SAX Parsers whereas XercesDOM, SunDOM, OracleDOM are DOM parsers.

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Frequently asked. Among first few questions in the J2EE segment of interview.

Q2. What is deployment descriptor ?

or

What is the use of deployment descriptor ?

Java EE

Ans. Deployment Descriptor which is usually web.xml is used to specify the classes, resources and configuration of the application and how the web server uses them to serve web requests.This file is usually added to WEB-INF folder and contains following

* Servlet entries and url mapping
* Plugins
* Some info regarding authentication / filters
* Landing Page
* Event Handlers

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Q3. what are well formed and valid xmls ?

XML

Ans. Well formed xml has all tags closed in the right order. well formed refers to syntax.
Valid xml is xml that succeeds validation against a DTD

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Q4. what kind of dtd have you worked with ?

XML

^{This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.}

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Q5. Is XML case sensitive ?

XML

Ans. Yes

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Q6. what is a qualified name ?

XML

Ans. QNames were introduced by XML Namespaces in order to be used as URI references.It defines a valid identifier for elements and attributes. QNames are generally used to reference particular elements or attributes within XML documents.

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Q7. What is XPath ?

XML

Ans. XPath (XML Path Language) is a query language for selecting nodes from an XML document. In addition, XPath may be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document

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