Describe External Entity, Internal Entity and Parameter Entity in XML with suitable Example of each

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In XML, entities are used to store data that can be referenced within the XML document. There are three types of entities in XML: external entities, internal entities, and parameter entities.

External Entity: An external entity is an entity that is defined in a separate file and referenced within the XML document. The entity declaration includes a URL or file path to the external entity.
Example:

<!DOCTYPE book [
  <!ENTITY copyright SYSTEM "copyright.txt">
]>
<book>
  <title>My Book</title>
  <author>John Doe</author>
  <copyright>&copyright;</copyright>
</book>
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Degree : MASTER DEGREE PROGRAMMES
Course Name : Master of Computer Applications
Course Code : MCA
Subject Name : Advanced Internet Technologies
Subject Code : MCS 51
Year : 2022 2023