XML documents can have a reference to a DTD or to an XML Schema.
Look at this simple XML document called "note.xml":
The following example is a DTD file called "note.dtd" that defines the elements of the XML document above ("note.xml"):
The first line defines the note element to have four child elements: "to, from, heading, body".
Line 2-5 defines the to, from, heading, body elements to be of type "#PCDATA".
The following example is an XML Schema file called "note.xsd" that defines the elements of the XML document above ("note.xml"):
The note element is a complex type because it contains other elements. The other elements (to, from, heading, body) are simple types because they do not contain other elements. You will learn more about simple and complex types in the following chapters.
This XML document has a reference to a DTD:
This XML document has a reference to an XML Schema:
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