====== XSD How To? ======
XML documents can have a reference to a DTD or to an XML Schema.
===== A Simple XML Document =====
Look at this simple XML document called "note.xml":
Tove
Jani
Reminder
Don't forget me this weekend!
===== A DTD File =====
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".
===== An XML Schema =====
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.
===== A Reference to a DTD =====
This XML document has a reference to a DTD:
Tove
Jani
Reminder
Don't forget me this weekend!
===== A Reference to an XML Schema =====
This XML document has a reference to an XML Schema:
Tove
Jani
Reminder
Don't forget me this weekend!