Question 21 :
What is processing instruction ?
Information contained in an XML structure that is intended to be interpreted by a specific application.
Question 22 :
What is programmatic security ?
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 ?
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 ?
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 ?
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.