Parametric Entity
Parameter entities in XML are like variables that you can use to define parts of your document type definition (DTD) in XML.
To define a parameter entity, you use the % symbol followed by the entity name and its value.
Here is an example:
<!ENTITY % myEntity "some value">
You can then use the parameter entity in your DTD wherever you would use the value it represents. Here is an example:
<!ELEMENT myElement (%myEntity;)>
When the DTD is processed, the parameter entity ‘%myEntity;’ will be replaced with its value, “some value”, in this case. This allows you to define parts of your DTD in one place and reuse them throughout the DTD, making your DTD more concise and easier to maintain.
Parameter entities are particularly useful when you have parts of your DTD that are used in multiple places or change easily. By defining these parts as parameter entities, you can make your DTD more flexible and adaptable to different needs.
What are XML Entities ?
XML is a way to organize information on the internet. It’s like a recipe that tells computers how to understand and use the information. Entities in XML are like ingredients in a recipe. They help you define and reuse parts of your information, making it easier to manage and share.