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								        Explain the concepts and capabilities of Portal Structure Markup Language (PSML).- PSML was created to allow abstraction and content structure within Jetspeed. 
  - It has two markups: 1. Registry markup 2. Site markup
  1. Registry markup:  - Describes the availability of resources to the Jetspeed engine.  - It supports multiple portlet registries.
  2. Site markup:  - The availability of portlets are described by this markup, which is displayed for a given user.
								          
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