Entities
- XML's way of referring to a data item.
- Text or Binary data.
- General Entity
- Use in the content of XML document
- References start with '&' and end with ';'
- Parameter Entity
- Use in a DTD
- References start with '%' and end with ';'
- Internal Entity - Defined in XML Document
- External Entity - Defined in a external source: file, URI.
