Meaning of Tag Libraries:
In a Web
application, a common design goal is to separate the display code from business
logic. Java tag libraries are one solution to this problem. Tag libraries allow
you to isolate business logic from the display code by creating a Tag class
(which performs the business logic) and including an HTML-like tag in your JSP
page. When the Web server encounters the tag within your JSP page, the Web
server will call methods within the corresponding Java Tag class to produce the
required HTML content.
Namespaces
Advantages
- It helps us avoid real name clashes with other XML vocabularies.
- Moreover, namespaces may be used, if XML documents will be distributed to others, when name collisions may really become an issue.
Disadvantages
- Namespaces, increases the size of XML documents.
- With namespaces, we need to be extra careful while writing applications (all our programming expressions, querying & creating the XML nodes must be namespace aware). This namespace-awareness overhead (effort to create, and maintain) should be incurred, only if an application requires it (i.e, if management of name collisions isreally needed).
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