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Question 26 :

What is XML ?

Answer :

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.

Question 27 :

What is XML registry ?

Answer :

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.

Question 28 :

What is XML Schema ?

Answer :

The W3C specification for defining the structure, content, and semantics of XML documents.

Question 29 :

What is XPath ?

Answer :

An addressing mechanism for identifying the parts of an XML document.

Question 30 :

What is XPointer ?

Answer :

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.