Set - 5

Question 21 :

What is processing instruction ?

Answer :

Information contained in an XML structure that is intended to be interpreted by a specific application.


Question 22 :

What is programmatic security ?

Answer :

Security decisions that are made by security-aware applications. Programmatic security is useful when declarative security alone is not sufficient to express the security model of an application.


Question 23 :

What is prolog ?

Answer :

The part of an XML document that precedes the XML data. The prolog includes the declaration and an optional DTD.


Question 24 :

What is public key certificate ?

Answer :

Used in client-certificate authentication to enable the server, and optionally the client, to authenticate each other. The public key certificate is the digital equivalent of a passport. It is issued by a trusted organization, called a certificate authority, and provides identification for the bearer.


Question 25 :

What is publish/subscribe messaging system ?

Answer :

A messaging system in which clients address messages to a specific node in a content hierarchy, called a topic. Publishers and subscribers are generally anonymous and can dynamically publish or subscribe to the content hierarchy. The system takes care of distributing the messages arriving from a node's multiple publishers to its multiple subscribers.