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Introduction to XML For Web Developers
Parameter Entities  

Parameter entities, that can also be either internal or external, are only used within the DTD that we will discus in the next section so we will defer a serious discussion until then. However, we will mention that a well-formed parameter entity will look the same as a general entity except that it will include the "%" specifier. Consider the following example:

<!ENTITY % NAME "text that you want to be represented by the entity">

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