Parameter Entity Example in a DTD

Suppose you define the invoice parameter entity as an internal entity as follows:


<!ENTITY % customer "name, street, city, state, zipcode">

The percent sign (%) after the ENTITY keyword indicates that this is a parameter entity. Later in the DTD, you can reference this parameter entity as follows:


<!ELEMENT invoice (%customer;, item, price, date)>

When this DTD is processed, it is as if you had specified the following:


<!ELEMENT invoice (name, street, city, state, zipcode, item, price, date)>

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