XML DTDLesson 80Free preview

DTD Entities

This lesson is part of XML · All levels

Summary

Entity is an abbreviation for value that can be reused in an XML or DTD document. XML provides five built-in entities for specific characters, while the entity itself is declared with the <!ENTITY name "value">. There are also entity parameters that use the % sign and are specifically used in DTD.

Key points

The built-in entity: < > & apos; & quot;
Custom entity: <!ENTITY writer "Doe"> and then used as &writer;
The entity parameter uses % and only applies to DTD
The internal entity is written direct value, the external pointing to the file
External entities could be at risk of XXE security if parser is allowed.

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