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Home > Online Product Documentation > Table of Contents > Defining General Entities and Parameter Entities in DTDs Defining General Entities and Parameter Entities in DTDsIn DTDs, an entity allows you to define a symbol for a value. In the Tree view, you can define general entities and parameter entities. The value of a general entity can be just about anything. It can be General entities are useful for things that change often, such as the name of a product in development. An entity allows you to change the value in one place and have the corrected value appear everywhere it is needed. See also Description of Entity and Parameter Entity Properties in DTDs. When you define a general entity, you specify a symbol that you can use in instance documents. When the XML parser finds a reference to a general entity, it replaces the symbol with the value you specified when you defined the general entity. When you define a parameter entity, you specify a symbol that you can use elsewhere in the DTD. Again, when the XML parser finds a reference to a parameter entity, it replaces the reference with the value you specified when you defined the parameter entity. In a DTD, the definition of an entity must appear before a reference to that entity. Therefore, it is good practice to put all entity declarations at the beginning of a DTD. This section discusses the following topics: |
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