The correct definition is that they refer to data that an XML processor has to parse. External entities are useful for creating a common reference that can be shared between multiple documents. Any changes that are made to external entities are automatically updated in the documents they are referenced.
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The correct definition is that they refer to data that an XML processor has to parse. External entities are useful for creating a common reference that can be shared between multiple documents. Any changes that are made to external entities are automatically updated in the documents they are referenced.